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Long Term Obligations (Term Loan) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Oct. 31, 2016
Dec. 31, 2015
Jul. 09, 2014
Senior Secured Term Loan          
Debt Instrument [Line Items]          
Face amount of term loan         $ 300,000,000
Gains (losses) on extinguishment of debt $ 2,200,000        
Interest rate (percent) 6.20% 6.20%     7.20%
Unamortized discount on term loan $ 0 $ 0   $ 4,600,000 $ 5,300,000
Minimum | Senior Secured Term Loan | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent)   5.00%      
Line of Credit | Minimum | Base Rate          
Debt Instrument [Line Items]          
Interest rate (percent)     0.75%    
Line of Credit | Minimum | Eurodollar          
Debt Instrument [Line Items]          
Interest rate (percent)     1.75%    
Line of Credit | Maximum | Base Rate          
Debt Instrument [Line Items]          
Interest rate (percent)     1.50%    
Line of Credit | Maximum | Eurodollar          
Debt Instrument [Line Items]          
Interest rate (percent)     2.50%