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Derivatives - Narrative (Details)
$ in Millions
1 Months Ended
Jun. 30, 2009
USD ($)
contract
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
May 20, 2013
8.00% Convertible Senior Notes Issued in 2013        
Derivative [Line Items]        
Loan interest rate   8.00%   8.00%
Interest rate cap        
Derivative [Line Items]        
Number of Interest rate cap agreements (in contracts) | contract 5      
Maturity period 10 years      
Derivative asset   $ 0.0 $ 0.0  
Interest rate cap | Six-month LIBOR Rate        
Derivative [Line Items]        
Base rate to be capped, should the Base Rate not exceed 6.50% 5.50%      
Interest on outstanding amounts on the Facility Agreement 6.50%      
Base rate to be lowered from LIBOR, should the base rate exceed 6.50% 1.00%      
Fee for interest rate cap agreements $ 12.4