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Debt - Term Loan (Details) - USD ($)
12 Months Ended
Jun. 21, 2016
Jul. 11, 2014
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 22, 2016
Jun. 15, 2016
Debt Instrument [Line Items]              
Repayments of debt     $ 118,751,000 $ 603,770,000 $ 202,165,000    
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          
Bridge Loan              
Debt Instrument [Line Items]              
Deferred finance costs, net           $ 3,000,000  
Bridge Loan | Secured Debt              
Debt Instrument [Line Items]              
Line credit maximum borrowing amount   $ 75,000,000          
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%          
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