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Senior Debt (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 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% 35.00%  
Event of default-not satisfied or bonded judgment in excess of $ 50,000,000 $ 50,000,000  
Maximum period allowed for pending judgment to satisfy or bond (in days) 30 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 4.25  
Actual consolidated total leverage ratio 2.52 2.52  
Required consolidated senior secured leverage ratio, maximum 2.75 2.75  
Actual consolidated senior secured leverage ratio 0.66 0.66  
Required consolidated fixed charge coverage ratio, minimum 1.75 1.75  
Actual consolidated fixed charge coverage ratio 1.86 1.86  
Covenants [Abstract]      
Covenants for senior credit facilities - amount available under restricted payment basket $ 20,000,000 $ 20,000,000  
Outstanding indebtedness less cash in excess of 25,000,000 25,000,000  
Consolidated funded debt outstanding 734,900,000 734,900,000  
Consolidated EBITDA   292,100,000  
Consolidated senior secured debt outstanding 192,100,000 192,100,000  
Adjusted consolidated EBITDA   528,000,000  
Consolidated fixed charges   284,100,000  
Senior credit facilities, maximum amount 900,000,000 900,000,000  
Senior credit facilities, additional amount allowed 250,000,000 250,000,000  
Mandatory Excess Cash Flow Pre-Payment 27,000,000    
Term loan, maximum facility 225,000,000 225,000,000  
Term loan, amount outstanding 193,500,000 193,500,000 $ 221,100,000
Revolving facility, maximum facility 675,000,000 675,000,000  
Revolving facility, amount outstanding 20,000,000 20,000,000 190,000,000
Letters of credit, amount outstanding 94,700,000 94,700,000  
Letters of credit, amount available 560,300,000 560,300,000  
Unsecured line of credit, maximum facility 20,000,000 20,000,000  
Unsecured line of credit, amount outstanding $ 0 0 14,600,000
Commitment fee percentage 0.50%    
Maturities of Long-term Debt [Abstract]      
2015 $ 1,687,000 1,687,000  
2016 2,250,000 2,250,000  
2017 2,250,000 2,250,000  
2018 22,250,000 22,250,000  
2019 2,250,000 2,250,000  
Thereafter 182,813,000 182,813,000  
Secured Debt $ 213,500,000 213,500,000  
Term Loan [Member]      
Covenants [Abstract]      
Unamortized Debt Issuance Expense     300,000
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 0  
Maturities of Long-term Debt [Abstract]      
2015 0 0  
2016 0 0  
2017 0 0  
2018 0 0  
2019 0 0  
Thereafter $ 0 0  
Revolving Credit Facility [Member]      
Covenants [Abstract]      
Maturity date Mar. 19, 2019    
Revolving facility, amount outstanding $ 20,000,000 20,000,000  
Unamortized Debt Issuance Expense 5,200,000 5,200,000 $ 5,700,000
Maturities of Long-term Debt [Abstract]      
2015 0 0  
2016 0 0  
2017 0 0  
2018 20,000,000 20,000,000  
2019 0 0  
Thereafter $ 0 $ 0  
Revolving Credit Facility [Member] | Prime Rate [Member]      
Covenants [Abstract]      
Margin on Prime Rate, actual 1.50% 1.50%  
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 2.50% 2.50%  
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% 3.00%  
Margin on Prime Rate, actual 2.00% 2.00%  
Term loan, amount outstanding $ 193,500,000 $ 193,500,000  
Term Loan, Periodic Payment, Principal $ 562,500    
Term Loan, Frequency of Periodic Payment quarterly    
Unamortized Debt Issuance Expense $ 300,000 300,000  
Maturities of Long-term Debt [Abstract]      
2015 1,687,000 1,687,000  
2016 2,250,000 2,250,000  
2017 2,250,000 2,250,000  
2018 2,250,000 2,250,000  
2019 2,250,000 2,250,000  
Thereafter $ 182,813,000 $ 182,813,000