Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Carrying Amounts and Fair Value of Long Term Debt (Details)

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Fair Value Measurements - Carrying Amounts and Fair Value of Long Term Debt (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Feb. 28, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long term debt, net $ 773,062 $ 709,611  
Debt 833,571    
Fair Value 658,215 690,360  
Issuance of stock to repurchase company 19,584 8,450  
Finance lease, liability 700    
Unamortized discount 60,509 65,186  
Term loan facility      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long term debt, net 485,166 455,292  
Debt 506,037 478,125  
Fair Value 454,168 473,344  
Revolving Credit Facility      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long term debt, net 43,315 54,015  
Debt 43,315 54,015  
Fair Value 43,315 54,015  
Convertible senior notes      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long term debt, net 71,126 70,419  
Debt 82,500 82,500  
Fair Value $ 37,125 49,064  
Stated interest rate 2.75%   2.75%
Equity component of convertible debt $ 13,000    
Other debt      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long term debt, net 23,683 1,707  
Debt 23,685 1,707  
Fair Value 23,685 1,707  
Equipment Financing      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other long term debt 3,400    
Finance lease, liability 19,000    
2.75% Convertible Senior Notes Due 2035 | Convertible senior notes      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long term debt, net 82,500    
Second Lien Credit Agreement      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long term debt, net 149,772 128,178  
Debt 178,000    
Fair Value 99,922 $ 112,230  
Issuance of stock to repurchase company 28,000    
Second Lien Credit Agreement | Penny Warrants      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity component of convertible debt 14,900    
Second Lien Credit Agreement | Market Warrants      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity component of convertible debt $ 9,300