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Debt - 5% Convertible Senior Note Due 2021 (Details)
1 Months Ended 8 Months Ended 12 Months Ended
Jun. 27, 2016
USD ($)
shares
Jun. 21, 2016
USD ($)
$ / shares
Jun. 30, 2016
USD ($)
trading_day
day
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 15, 2016
USD ($)
Debt Instrument [Line Items]                
Repayments of debt         $ 241,336,000 $ 118,751,000 $ 603,770,000  
Principal amount of long-term debt       $ 634,737,000 634,737,000 416,466,000    
Unamortized discount (premium) and debt issuance costs       $ 22,806,000 $ 22,806,000 23,826,000    
5% Convertible Senior Notes due 2021                
Debt Instrument [Line Items]                
Debt instrument, interest rate     5.00% 5.00% 5.00%      
Convertible Debt | 5% Convertible Senior Notes due 2021                
Debt Instrument [Line Items]                
Aggregate principal amount     $ 115,000,000          
Additional principal amount     15,000,000          
Proceeds from borrowings     $ 111,600,000          
Unamortized discount and debt issuance costs, percentage     3.00%          
Debt instrument, interest rate       5.00% 5.00%      
Conversion rate 55.5556              
Number of equity instruments (in shares) | shares 6,388,894              
Conversion price (in dollars per share) | $ / shares   $ 18.00            
Threshold percentage of stock price trigger 140.00%              
Threshold trading days | day     20          
Threshold consecutive trading days | trading_day     30          
Redemption price, percentage 100.00%              
Repurchase face amount       $ 66,300,000 $ 66,300,000      
Repayments of convertible debt       $ 18,600,000        
Issuance of common stock for convertible notes repurchase, net (in shares) | shares       3,200,000        
Repurchase of convertible debt       $ 74,300,000        
Debt extinguishment and commitment costs         (6,100,000)      
Long-term debt, fair value $ 89,300,000              
Carrying amount of equity component 22,200,000     28,700,000 28,700,000      
If-converted value in excess of principal         14,200,000      
Principal amount of long-term debt       48,665,000 48,665,000 $ 115,000,000    
Unamortized discount (premium) and debt issuance costs       3,900,000 3,900,000      
Term Loan | Tranche B Term Loan                
Debt Instrument [Line Items]                
Repayments of debt   $ 5,000,000            
Deferred finance costs, net               $ 2,500,000
Long-term Debt | Convertible Debt | 5% Convertible Senior Notes due 2021                
Debt Instrument [Line Items]                
Deferred finance costs, net $ 600,000              
Reported Value Measurement | 5% Convertible Senior Notes due 2021                
Debt Instrument [Line Items]                
Long-term debt, fair value       $ 44,800,000 $ 44,800,000