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Senior Debt (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Covenants [Abstract]    
Covenant limitation incur additional debt in excess of $ 250,000,000  
Maximum pro forma senior leverage ratio 2.50  
Pro forma consolidated leverage ratio 2.75  
Consolidated funded debt outstanding 880,700,000  
Consolidated EBITDA 334,100,000  
Outstanding indebtedness less cash in excess of 25,000,000  
Adjusted Consolidated EBITDA 485,100,000  
Consolidated fixed charges 351,500,000  
Debt Instrument [Line Items]    
Term loan, maximum facility 250,000,000 250,000,000
Term loan, amount outstanding 187,500,000 212,500,000
Term loan, amount available 0 0
Senior credit facilities, maximum facility 750,000,000 750,000,000
Senior credit facilities, amount outstanding 348,000,000 387,500,000
Senior credit facilities, amount available 234,830,000 215,405,000
Debt facilities, maximum facility 770,000,000 770,000,000
Debt facilities, amount outstanding 366,275,000 387,500,000
Debt facilities, amount available 236,555,000 235,405,000
Letters of credit, outstanding 104,700,000 109,600,000
Financial Covenants Ratios (Table Details) [Abstract]    
Required consolidated leverage ratio, maximum 3.25  
Actual consolidated leverage ratio 2.64  
Required fixed charge coverage ratio, minimum 1.35  
Actual fixed charge coverage ratio 1.38  
Interest Rate [Abstract]    
Interest period Interest periods range from seven days (for borrowings under the revolving credit facility only) to one, two, three or six months, at our election  
Margin on Eurodollar rate 2.25%  
Margin on prime rate 1.25%  
Weighted average margin on Eurodollar rate 2.08%  
Weighted average margin on prime rate 1.08%  
Commitment fee percentage, minimum 0.30%  
Commitment fee percentage, maximum 0.50%  
Schedule Maturity Dates (Table Details) [Abstract]    
2014 43,275,000  
2015 25,000,000  
2016 298,000,000  
Total 366,275,000 387,500,000
Senior Debt (Details) [Abstract]    
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  
Maximum fund drawn on individual occasion 100,000,000  
Maximum total amount outstanding 221,000,000  
Prime Rate [Member]
   
Debt Instrument [Line Items]    
Description of variable rate basis prime rate  
Prime Rate [Member] | Minimum [Member]
   
Debt Instrument [Line Items]    
Basis margin on variable rate 0.50%  
Prime Rate [Member] | Maximum [Member]
   
Debt Instrument [Line Items]    
Basis margin on variable rate 1.50%  
Eurodollar Rate [Member]
   
Debt Instrument [Line Items]    
Description of variable rate basis Eurodollar rate  
Eurodollar Rate [Member] | Minimum [Member]
   
Debt Instrument [Line Items]    
Basis margin on variable rate 1.50%  
Eurodollar Rate [Member] | Maximum [Member]
   
Debt Instrument [Line Items]    
Basis margin on variable rate 2.50%  
Credit Facility Term Loan [Member]
   
Debt Instrument [Line Items]    
Maturity date Jul. 14, 2016  
Credit Facility Revolver [Member]
   
Debt Instrument [Line Items]    
Maturity date Jul. 14, 2016  
Line of credit, maximum facility 500,000,000 500,000,000
Line of credit, amount outstanding 160,500,000 175,000,000
Line of credit, amount available 234,830,000 215,405,000
Intrust Bank Line of Credit [Member]
   
Debt Instrument [Line Items]    
Line of credit, maximum facility 20,000,000 20,000,000
Line of credit, amount outstanding 18,275,000 0
Line of credit, amount available $ 1,725,000 $ 20,000,000