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Senior Debt (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]      
Senior credit facilities, maximum amount $ 900,000,000 $ 900,000,000  
Senior credit facilities, additional amount allowed 250,000,000 250,000,000  
Term loan, maximum facility 225,000,000 225,000,000  
Term loan, amount outstanding 221,600,000 221,600,000 $ 223,300,000
Revolving facility, maximum facility 675,000,000 675,000,000  
Revolving facility, amount outstanding 150,000,000 150,000,000 255,000,000
Letters of credit, amount outstanding 92,300,000 92,300,000  
Letters of credit, amount available 432,700,000 432,700,000  
Unsecured line of credit, maximum facility 20,000,000 20,000,000  
Unsecured line of credit, amount outstanding $ 0 0 14,500,000
Commitment fee percentage 0.50%    
Maturities of Long-term Debt [Abstract]      
2015 $ 562,000 562,000  
2016 2,250,000 2,250,000  
2017 2,250,000 2,250,000  
2018 2,250,000 2,250,000  
2019 152,250,000 152,250,000  
Thereafter 212,063,000 212,063,000  
Secured Debt 371,625,000 $ 371,625,000 $ 492,813,000
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 4.50 4.50  
Actual consolidated total leverage ratio 2.93 2.93  
Required consolidated senior secured leverage ratio, maximum 2.75 2.75  
Actual consolidated senior secured leverage ratio 1.12 1.12  
Required consolidated fixed charge coverage ratio, minimum 1.5 1.5  
Actual consolidated fixed charge coverage ratio 1.86 1.86  
Covenants [Abstract]      
Covenants for senior credit facilities - amount available under restricted payment basket $ 60,900,000 $ 60,900,000  
Outstanding indebtedness less cash in excess of 25,000,000 25,000,000  
Consolidated funded debt outstanding 879,300,000 879,300,000  
Consolidated EBITDA   300,000,000  
Consolidated senior secured debt outstanding $ 336,600,000 336,600,000  
Adjusted consolidated EBITDA   542,600,000  
Consolidated fixed charges   291,700,000  
Minimum [Member]      
Debt Instrument [Line Items]      
Commitment fee percentage 0.30%    
Maximum [Member]      
Debt Instrument [Line Items]      
Commitment fee percentage 0.50%    
Eurodollar [Member]      
Debt Instrument [Line Items]      
Description of variable rate basis Eurodollar rate    
Prime Rate [Member]      
Debt Instrument [Line Items]      
Description of variable rate basis prime    
Revolving Facility [Member]      
Debt Instrument [Line Items]      
Maturity date Mar. 19, 2019    
Revolving facility, amount outstanding $ 150,000,000 150,000,000  
Maturities of Long-term Debt [Abstract]      
2015 0 0  
2016 0 0  
2017 0 0  
2018 0 0  
2019 150,000,000 150,000,000  
Thereafter $ 0 $ 0  
Revolving Facility [Member] | Eurodollar [Member]      
Debt Instrument [Line Items]      
Margin on Eurodollar rate, actual 2.50% 2.50%  
Revolving Facility [Member] | Eurodollar [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Basis margin on variable rate 1.50%    
Revolving Facility [Member] | Eurodollar [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Basis margin on variable rate 2.75%    
Revolving Facility [Member] | Prime Rate [Member]      
Debt Instrument [Line Items]      
Margin on Prime Rate, actual 1.50% 1.50%  
Revolving Facility [Member] | Prime Rate [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Basis margin on variable rate 0.50%    
Revolving Facility [Member] | Prime Rate [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Basis margin on variable rate 1.75%    
Term Loan [Member]      
Debt Instrument [Line Items]      
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 $ 221,625,000 $ 221,625,000  
Term Loan, Periodic Payment, Principal $ 562,500    
Term Loan, Frequency of Periodic Payment quarterly    
Maturities of Long-term Debt [Abstract]      
2015 $ 562,000 562,000  
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 $ 212,063,000 212,063,000  
Line of Credit [Member]      
Debt Instrument [Line Items]      
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