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Debt - 5% Convertible Senior Note Due 2021 (Details)
1 Months Ended 9 Months Ended 12 Months Ended
Jun. 27, 2016
USD ($)
shares
Jun. 30, 2016
USD ($)
Sep. 30, 2016
Dec. 31, 2016
USD ($)
day
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jun. 21, 2016
$ / shares
Jun. 15, 2016
USD ($)
Debt Instrument [Line Items]                
Proceeds from borrowings       $ 354,682,000 $ 208,158,000 $ 363,620,000    
Deferred finance costs, net       30,024,000 4,907,000      
Principal amount of long-term debt       400,420,000 170,119,000      
5% Convertible Senior Notes due 2021                
Debt Instrument [Line Items]                
Principal amount of long-term debt         0      
Tranche B Term Loan                
Debt Instrument [Line Items]                
Principal amount of long-term debt       $ 60,361,000 $ 60,119,000      
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            
Debt instrument, interest rate       0.50%     5.00%  
Number of equity instruments | shares 6,388,894              
Conversion price | $ / shares             $ 18  
Threshold percentage of stock price trigger 140.00%              
Threshold trading days | day       20        
Threshold consecutive trading days     30 days          
Redemption price, percentage 100.00%              
Long-term debt, fair value $ 89,300,000              
Carrying amount of equity component 22,200,000              
Principal amount of long-term debt       $ 115,000,000        
Unamortized discount (premium) and debt issuance costs       24,000,000        
Term Loan | Tranche B Term Loan                
Debt Instrument [Line Items]                
Repayments of debt 5,000,000 $ 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       $ 91,029,000