Quarterly report pursuant to Section 13 or 15(d)

Financing Arrangements - Summary of Outstanding Indebtedness (Details)

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Financing Arrangements - Summary of Outstanding Indebtedness (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Feb. 28, 2019
Dec. 31, 2018
Jan. 06, 2017
Debt Instrument [Line Items]            
Debt instrument, face amount $ 791,469,000 $ 791,469,000     $ 774,797,000  
Unamortized bond discounts, fair value adjustments and issue costs, net (61,183,000) (61,183,000)     (65,186,000)  
Total carrying value of debt 730,286,000 730,286,000     709,611,000  
Less: current portion, net (17,005,000) (17,005,000)     (22,673,000)  
Total non-current 713,281,000 713,281,000     686,938,000  
Long-term debt 791,469,000 791,469,000        
Paid-in-Kind interest converted to principal   9,507,000 $ 0      
Finance lease liability 19,113,000 19,113,000        
Second Lien Credit Agreement            
Debt Instrument [Line Items]            
Debt instrument, face amount 167,957,000 167,957,000     158,450,000  
Long-term debt 138,600,000 138,600,000     128,200,000  
Paid-in-Kind interest converted to principal 9,500,000          
Term loan facility            
Debt Instrument [Line Items]            
Debt instrument, face amount 468,750,000 468,750,000     478,125,000  
Revolving Credit Facility            
Debt Instrument [Line Items]            
Debt instrument, face amount 42,415,000 42,415,000     54,015,000  
Convertible senior notes            
Debt Instrument [Line Items]            
Debt instrument, face amount 82,500,000 82,500,000     82,500,000  
Total carrying value of debt $ 82,500,000 $ 82,500,000        
Stated interest rate 2.75% 2.75%        
Long-term debt $ 70,800,000 $ 70,800,000     70,400,000  
Equity component of convertible debt 13,000,000 13,000,000        
Subordinated Debt            
Debt Instrument [Line Items]            
Debt instrument, face amount         158,450,000  
Other debt            
Debt Instrument [Line Items]            
Debt instrument, face amount 29,847,000 29,847,000     $ 1,707,000  
Line of Credit            
Debt Instrument [Line Items]            
Letters of credit outstanding 4,200,000 4,200,000        
Transponder Equipment Financing            
Debt Instrument [Line Items]            
Other long term debt 6,200,000 6,200,000        
Penny Warrants | Second Lien Credit Agreement            
Debt Instrument [Line Items]            
Equity component of convertible debt 14,900,000 14,900,000        
Market Warrants | Second Lien Credit Agreement            
Debt Instrument [Line Items]            
Equity component of convertible debt 9,300,000 9,300,000        
Revolving Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity           $ 85,000,000.0
Line of credit, available balance 38,900,000 38,900,000        
Letters of Credit | Line of Credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity           $ 15,000,000.0
Letters of credit outstanding 3,700,000 3,700,000        
2017 Credit Agreement | Other debt            
Debt Instrument [Line Items]            
Debt instrument, face amount 38,900,000 38,900,000        
2017 Credit Agreement | Line of Credit            
Debt Instrument [Line Items]            
Letters of credit outstanding 3,700,000 3,700,000        
Wireless Maritime Services            
Debt Instrument [Line Items]            
Payable to related party $ 3,100,000 $ 3,100,000   $ 7,400,000