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Total Debt - Schedule of debt outstanding (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 16, 2015
Dec. 31, 2014
Dec. 16, 2013
Debt Instrument [Line Items]        
Outstanding Principal $ 788,750   $ 770,355  
Debt, Unamortized Premium 2,978   0  
Unamortized Debt Issuance Costs and Loan Origination Fees 9,946   6,251  
Long-term Debt, Net 781,782   764,104  
Current maturities of long-term debt 16,250   11,250  
Total Debt, Net of Current Maturities, Outstanding Principal 772,500   759,105  
Long-term Debt, Excluding Current Maturities 765,532   752,854  
Debt interest rate   5.375%   5.375%
Secured Debt        
Debt Instrument [Line Items]        
Outstanding Principal 188,750   470,355  
Debt, Unamortized Premium 0   0  
Unamortized Debt Issuance Costs and Loan Origination Fees 638   787  
Long-term Debt, Net 188,112   469,568  
Unsecured Debt        
Debt Instrument [Line Items]        
Long-term Debt, Excluding Current Maturities 600,000      
Senior Secured Credit Facility due 2018 | Secured Debt        
Debt Instrument [Line Items]        
Outstanding Principal 0   258,000  
Debt, Unamortized Premium 0   0  
Unamortized Debt Issuance Costs and Loan Origination Fees 0   0  
Long-term Debt, Net 0   258,000  
Term Loan A due 2019 | Secured Debt        
Debt Instrument [Line Items]        
Outstanding Principal 188,750   200,000  
Debt, Unamortized Premium 0   0  
Unamortized Debt Issuance Costs and Loan Origination Fees 638   787  
Long-term Debt, Net 188,112   199,213  
Swing line of credit | Line of Credit        
Debt Instrument [Line Items]        
Outstanding Principal 0   12,355  
Debt, Unamortized Premium 0   0  
Unamortized Debt Issuance Costs and Loan Origination Fees 0   0  
Long-term Debt, Net 0   12,355  
5.375% Senior Unsecured Notes due 2021 | Unsecured Debt        
Debt Instrument [Line Items]        
Outstanding Principal 600,000   300,000  
Debt, Unamortized Premium 2,978   0  
Unamortized Debt Issuance Costs and Loan Origination Fees 9,308   5,464  
Long-term Debt, Net $ 593,670   $ 294,536  
Debt interest rate 5.375%   5.375%