Annual report pursuant to Section 13 and 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Carrying Amount of Long-term Debt (Details)

v3.19.1
Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Carrying Amount of Long-term Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Feb. 28, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying Amount   $ 774,797 $ 660,200    
Fair Value   690,360 617,333    
Conversion of PIK interest on our Second Lien Notes to additional principal   8,450 0 $ 0  
Unamortized discount   65,186 41,136    
Term loans with banks          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying Amount   478,125 490,625    
Fair Value   473,344 486,945    
Revolving Credit Facility          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying Amount   54,015 78,000    
Fair Value   54,015 78,000    
Convertible senior notes          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying Amount   82,500 82,500    
Fair Value   $ 49,064 43,313    
Stated interest rate   2.75%     2.75%
Debt instrument, convertible, carrying amount of equity component   $ 13,000      
Second lien notes, due 2023          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying Amount   158,450 0    
Fair Value   112,230 0    
Other debt          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying Amount   1,707 9,075    
Fair Value   1,707 $ 9,075    
Revolving Credit Facility          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Repayments of Debt $ 78,000        
Revolving Credit Facility | Line of Credit          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Repayments of Debt $ 78,000        
Penny Warrants | Second Lien Credit Agreement          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Debt instrument, convertible, carrying amount of equity component   14,900      
Market Warrants | Second Lien Credit Agreement          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Debt instrument, convertible, carrying amount of equity component   $ 9,300