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Debt - Senior Secured Second Priority Notes (Details) - Senior Secured Second Priority Notes - USD ($)
Mar. 10, 2017
Jun. 30, 2016
Debt Instrument [Line Items]    
Loss on early extinguishment on debt $ 5,800,000  
Cash premium 3.00%  
Early extinguishment of debt cash premium $ 3,700,000  
Non-cash charge for write-off of unamortized deferred financing costs 2,100,000  
7.50% Senior Notes, Due 2022    
Debt Instrument [Line Items]    
Aggregate principal amount   $ 610,000,000
Stated rate   7.50%
Aggregate principal amount redeemed 61,000,000  
7.75% Senior Notes, Due 2024    
Debt Instrument [Line Items]    
Aggregate principal amount   $ 625,000,000
Stated rate   7.75%
Aggregate principal amount redeemed $ 62,500,000