Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details)

v3.10.0.1
Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 27, 2018
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Jan. 06, 2017
Dec. 31, 2016
Jul. 27, 2016
Feb. 28, 2015
Accounting Policies [Line Items]                        
Restricted stock units vested and distributed, net of tax     $ 933,000         $ 933,000        
Proceeds from issuance of debt $ 143,000,000                      
Repayment of revolving credit facility           $ 78,000,000 $ 0          
Stated interest rate                       2.75%
Decrease in revenue   $ (165,962,000)   $ (155,742,000)   (322,459,000) (308,334,000)          
Decrease in cost of goods sold   (126,731,000)   (118,090,000)   (245,210,000) (228,630,000)          
Cash and cash equivalents   37,403,000 48,260,000     37,403,000   48,260,000        
Restricted Cash                        
Restricted cash   5,390,000 3,608,000     5,390,000   3,608,000        
Intangible Assets and Goodwill:                        
Impairment of goodwill   0   0   0 78,000,000 167,000,000        
Goodwill   159,610,000 159,696,000     159,610,000   159,696,000        
Income Taxes                        
Income tax benefit due to the Tax Act               4,600,000        
Impact due to repatriation charge               0        
Repatriation charge               18,500,000        
Adoption of New Accounting Standards                        
Increase in cash equivalents and restricted cash balances [1]   42,793,000 51,868,000 67,739,000   42,793,000 67,739,000 51,868,000   $ 68,678,000    
Decrease in cash used by operating activities           42,827,000 59,866,000          
Decrease in cash used in investing activities           24,472,000 41,638,000          
Media & Content                        
Intangible Assets and Goodwill:                        
Impairment of goodwill           0            
Goodwill   83,458,000 83,529,000     83,458,000   83,529,000        
Maritime & Land Connectivity Reporting Unit                        
Intangible Assets and Goodwill:                        
Impairment of goodwill     45,000,000   $ 78,000,000 0            
Goodwill   22,130,000 22,130,000     22,130,000   22,130,000        
Wireless Maritime Services                        
Accounting Policies [Line Items]                        
Maximum borrowing capacity   6,400,000       6,400,000            
Investments in Equity Affiliates                        
Equity method investment, ownership percentage                     49.00%  
Santander                        
Investments in Equity Affiliates                        
Equity method investment, ownership percentage                     49.00%  
Accumulated Deficit                        
Accounting Policies [Line Items]                        
Restricted stock units vested and distributed, net of tax     933,000         933,000        
MTN                        
Restricted Cash                        
Restricted cash                   16,000,000    
Public SPAC Warrants                        
Derivative Warrants                        
Change in value           100,000 200,000          
ASU 2014-09 | Accumulated Deficit                        
Accounting Policies [Line Items]                        
Restricted stock units vested and distributed, net of tax     $ 900,000         $ 900,000        
Adoption of New Accounting Standards                        
Increase in cash equivalents and restricted cash balances       $ 1,200,000     1,200,000     $ 18,000,000    
Decrease in cash used by operating activities             16,300,000          
Decrease in cash used in investing activities             $ 600,000          
ASU 2014-09 | Accumulated Deficit | Media & Content                        
Accounting Policies [Line Items]                        
Decrease in revenue   (305,000)       400,000            
Decrease in cost of goods sold   394,000       800,000            
Line of Credit                        
Accounting Policies [Line Items]                        
Maximum borrowing capacity                 $ 585,000,000      
Letters of credit outstanding   7,400,000       7,400,000            
Line of Credit | Revolving Credit Facility                        
Accounting Policies [Line Items]                        
Maximum borrowing capacity                 85,000,000      
Line of Credit | Letters of Credit                        
Accounting Policies [Line Items]                        
Maximum borrowing capacity                 $ 15,000,000      
Letters of credit outstanding   $ 6,200,000       $ 6,200,000            
[1] June 30, 2017 figures have been recast to include the impact of the adoption of ASU 2016-18. See Note 2. Basis of Presentation and Summary of Significant Accounting Policies