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Debt - 2023 Senior Notes (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2017
Aug. 31, 2015
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Debt Instrument [Line Items]              
Gain (loss) on debt extinguishment     $ 0 $ (9,516,000) $ 0 $ (9,516,000)  
Carrying value, net     742,535,000   742,535,000   $ 734,683,000
Senior Notes | 2023 Senior Notes              
Debt Instrument [Line Items]              
Aggregate principal amount of debt issued   $ 500,000,000 475,000,000   475,000,000    
Interest rate   7.875%          
Repurchased amount $ 25,000,000            
Gain (loss) on debt extinguishment $ (1,100,000)            
Carrying value, net     $ 466,906,000   $ 466,906,000   $ 466,291,000
Aggregate principal that must be held to accelerate amounts due (not less than)   25.00%          
Debt Instrument, Redemption, Period One | Senior Notes | 2023 Senior Notes              
Debt Instrument [Line Items]              
Repurchase price of principal amount of notes plus accrued and unpaid interest   35.00%          
Redemption price   107.875%          
Minimum outstanding percentage of principal after redemption   65.00%          
Debt Instrument, Additional Redemption, Period One | Senior Notes | 2023 Senior Notes              
Debt Instrument [Line Items]              
Redemption price   100.00%          
Debt Instrument, Redemption, Period Two | Senior Notes | 2023 Senior Notes              
Debt Instrument [Line Items]              
Redemption price   101.00%