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Senior Debt (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Senior Debt (Table Details) [Abstract]      
Initial Borrowing in Term Loans $ 225,000,000    
Initial Borrowing in Revolving Debt $ 100,000,000    
Event of default-3rd party ownership % of our voting stock 35.00%    
Event of default-not satisfied or bonded judgment in excess of $ 50,000,000    
Maximum period allowed for pending judgment to satisfy or bond (in days) 30    
Interest Rate [Abstract]      
Interest rate terms
Borrowings under the Revolving Facility bear interest at varying rates equal to either the Eurodollar rate plus 1.50% to 2.75%, or the prime rate plus 0.50% to 1.75% (ABR), at our election.
    
Financial Covenants Ratios (Table Details) [Abstract]      
Required consolidated total leverage ratio, maximum 4.25    
Actual consolidated total leverage ratio 2.37    
Required consolidated senior secured leverage ratio, maximum 2.75    
Actual consolidated senior secured leverage ratio 0.46    
Required consolidated fixed charge coverage ratio, minimum 1.75    
Actual consolidated fixed charge coverage ratio 1.83    
Covenants [Abstract]      
Covenants for senior credit facilities - amount available under restricted payment basket $ 20,000,000    
Outstanding indebtedness less cash in excess of 25,000,000    
Consolidated funded debt outstanding 672,500,000    
Consolidated EBITDA   $ 284,100,000  
Consolidated senior secured debt outstanding 129,800,000    
Adjusted consolidated EBITDA   520,500,000  
Consolidated fixed charges   $ 284,300,000  
Senior credit facilities, maximum amount 900,000,000    
Senior credit facilities, additional amount allowed 250,000,000    
Mandatory Excess Cash Flow Pre-Payment 27,000,000    
Term loan, maximum facility 225,000,000    
Term loan, amount outstanding 192,900,000   $ 221,100,000
Revolving facility, maximum facility 675,000,000    
Revolving facility, amount outstanding     190,000,000
Letters of credit, amount outstanding 94,700,000    
Letters of credit, amount available 580,300,000    
Unsecured line of credit, maximum facility 20,000,000    
Unsecured line of credit, amount outstanding $ 0   $ 14,600,000
Commitment fee percentage 0.45%    
Maturities of Long-term Debt [Abstract]      
2015 $ 1,125,000    
2016 2,250,000    
2017 2,250,000    
2018 2,250,000    
2019 2,250,000    
Thereafter 182,813,000    
Secured Debt $ 192,938,000    
Minimum [Member]      
Covenants [Abstract]      
Commitment fee percentage 0.30%    
Maximum [Member]      
Covenants [Abstract]      
Commitment fee percentage 0.50%    
Prime Rate [Member]      
Covenants [Abstract]      
Description of variable rate basis prime    
Eurodollar [Member]      
Covenants [Abstract]      
Description of variable rate basis Eurodollar rate    
Line of Credit [Member]      
Covenants [Abstract]      
Maturity date Aug. 21, 2016    
Unsecured line of credit, amount outstanding $ 0    
Maturities of Long-term Debt [Abstract]      
2015 0    
2016 0    
2017 0    
2018 0    
2019 0    
Thereafter $ 0    
Revolving Credit Facility [Member]      
Covenants [Abstract]      
Maturity date Mar. 19, 2019    
Revolving facility, amount outstanding $ 0    
Maturities of Long-term Debt [Abstract]      
2015 0    
2016 0    
2017 0    
2018 0    
2019 0    
Thereafter $ 0    
Revolving Credit Facility [Member] | Prime Rate [Member]      
Covenants [Abstract]      
Margin on Prime Rate, actual 1.25%    
Revolving Credit Facility [Member] | Prime Rate [Member] | Minimum [Member]      
Covenants [Abstract]      
Basis margin on variable rate 0.50%    
Revolving Credit Facility [Member] | Prime Rate [Member] | Maximum [Member]      
Covenants [Abstract]      
Basis margin on variable rate 1.75%    
Revolving Credit Facility [Member] | Eurodollar [Member]      
Covenants [Abstract]      
Margin on Eurodollar rate, actual 2.25%    
Revolving Credit Facility [Member] | Eurodollar [Member] | Minimum [Member]      
Covenants [Abstract]      
Basis margin on variable rate 1.50%    
Revolving Credit Facility [Member] | Eurodollar [Member] | Maximum [Member]      
Covenants [Abstract]      
Basis margin on variable rate 2.75%    
Term Loan [Member]      
Covenants [Abstract]      
Maturity date Mar. 19, 2021    
Margin on Eurodollar rate, actual 3.00%    
Margin on Prime Rate, actual 2.00%    
Term loan, amount outstanding $ 192,938,000    
Term Loan, Periodic Payment, Principal $ 562,500    
Term Loan, Frequency of Periodic Payment quarterly    
Maturities of Long-term Debt [Abstract]      
2015 $ 1,125,000    
2016 2,250,000    
2017 2,250,000    
2018 2,250,000    
2019 2,250,000    
Thereafter $ 182,813,000