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Debt - Term Loan (Details) - USD ($)
12 Months Ended
Jun. 21, 2016
Jul. 11, 2014
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 15, 2016
Debt Instrument [Line Items]            
Repayments of debt     $ 241,336,000 $ 118,751,000 $ 603,770,000  
Secured Debt            
Debt Instrument [Line Items]            
Original issue discount   5.00%        
Secured Debt | Term Loan            
Debt Instrument [Line Items]            
Line credit maximum borrowing amount   $ 50,000,000.0        
Bridge Loan | Secured Debt            
Debt Instrument [Line Items]            
Line credit maximum borrowing amount   $ 75,000,000.0        
Minimum | Secured Debt            
Debt Instrument [Line Items]            
Interest rate during period   10.00%        
Maximum | Secured Debt            
Debt Instrument [Line Items]            
Interest rate during period   12.00%        
2.5% Convertible Senior Note | Convertible Debt            
Debt Instrument [Line Items]            
Debt instrument, interest rate     2.50%      
Tranche B Term Loan | Term Loan            
Debt Instrument [Line Items]            
Deferred finance costs, net           $ 2,500,000
Repayments of debt $ 5,000,000          
Delayed Draw Term Loan and Bridge Loan Agreement            
Debt Instrument [Line Items]            
Financing costs expensed         $ 1,800,000  
Whitebox Advisors, LLC | Tranche B Term Loan | Term Loan            
Debt Instrument [Line Items]            
Deferred finance costs, net           $ 1,300,000
Repayments of debt $ 3,300,000