Long-term Debt (Details)
 12 Months Ended
Dec. 09, 2013
USD ($)
Feb. 15, 2013
USD ($)
amendment
Dec. 06, 2012
USD ($)
Aug. 08, 2012
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2012
USD ($)
Line of Credit Facility [Line Items]                  
Line of credit, maximum borrowing capacity       $ 390,000,000          
Percent of assets pledged for secured debt       100.00%          
Amortization of debt discount             $ 900,000    
Deferred finance costs             5,700,000    
Loss on extinguishment of debt         $ 0 $ 0 15,918,000    
Amortization of debt issuance costs and accretion of original issue discount         $ 122,000 122,000 2,511,000    
Effective interest rate         3.75%        
Commitment fee percentage         0.50%        
Interest expense, debt           15,900,000 22,900,000    
Interest costs capitalized           2,000,000 2,300,000    
Covenant terms, maximum indebtedness exclusions         $ 40,000,000        
Secured leverage ratio         3.75        
Long-term Debt, by Current and Noncurrent [Abstract]                  
Term loan         $ 387,097,000 391,057,000      
Less current maturities         (3,960,000) (3,960,000)   $ (3,960,000)  
Total long-term debt         383,137,000 387,097,000   $ 383,137,000  
Term Facility [Member]                  
Line of Credit Facility [Line Items]                  
Line of credit, maximum borrowing capacity       $ 350,000,000          
Unamortized discount                 $ 7,000,000
Payments of special dividend       350,000,000          
Long-term debt, fair value         $ 385,200,000 $ 386,200,000      
Effective interest rate         3.87% 3.75%      
Periodic principal payment         $ 1,000,000        
Periodic payment, balloon payment to be paid         $ 373,200,000        
Revolving Credit Facility [Member]                  
Line of Credit Facility [Line Items]                  
Line of credit, maximum borrowing capacity       40,000,000          
Effective interest rate           4.03%      
Interest rate, stated percentage           4.25%      
Letter of Credit [Member]                  
Line of Credit Facility [Line Items]                  
Line of credit, maximum borrowing capacity       10,000,000          
Swing Line Facility [Member]                  
Line of Credit Facility [Line Items]                  
Line of credit, maximum borrowing capacity       $ 5,000,000          
Federal Funds Effective Swap Rate [Member] | Term Facility [Member]                  
Line of Credit Facility [Line Items]                  
Basis spread on variable rate         0.50%        
Federal Funds Effective Swap Rate [Member] | Revolving Credit Facility [Member]                  
Line of Credit Facility [Line Items]                  
Basis spread on variable rate         0.50%        
London Interbank Offered Rate (LIBOR) [Member] | Term Facility [Member]                  
Line of Credit Facility [Line Items]                  
Basis spread on variable rate         1.00%        
Interest rate, variable rate         2.75%        
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]                  
Line of Credit Facility [Line Items]                  
Basis spread on variable rate         1.00%        
Interest rate, variable rate         3.25%        
Base Rate [Member] | Term Facility [Member]                  
Line of Credit Facility [Line Items]                  
Interest rate, variable rate         1.75%        
Base Rate [Member] | Revolving Credit Facility [Member]                  
Line of Credit Facility [Line Items]                  
Interest rate, stated percentage         2.25%        
First Amended Credit Facility [Member]                  
Line of Credit Facility [Line Items]                  
Payments of special dividend     $ 50,000,000            
First Amended Credit Facility [Member] | Term Facility [Member]                  
Line of Credit Facility [Line Items]                  
Additional borrowings     50,000,000            
Deferred finance costs     $ 1,200,000            
Second Amended Credit Facility [Member] | Term Facility [Member]                  
Line of Credit Facility [Line Items]                  
Deferred finance costs   $ 4,700,000              
Number of amendments | amendment   2              
Line of credit, principal amount   $ 399,000,000              
Variable rate decrease   (1.50%)              
Basis spread on variable rate decrease in floor   0.00%              
Second Amended Credit Facility [Member] | Revolving Credit Facility [Member]                  
Line of Credit Facility [Line Items]                  
Line of credit, principal amount             0    
Variable rate decrease   (1.50%)              
Second Amended Credit Facility [Member] | Interest Expense [Member] | Term Facility [Member]                  
Line of Credit Facility [Line Items]                  
Debt instrument, fee amount             $ 500,000    
Third Amended Credit Facility [Member]                  
Line of Credit Facility [Line Items]                  
Loss on extinguishment of debt $ 15,900,000                
Amortization of debt issuance costs and accretion of original issue discount 9,200,000                
Unamortized discount, net 5,700,000                
Debt issuance cost 1,000,000                
Third Amended Credit Facility [Member] | Term Facility [Member]                  
Line of Credit Facility [Line Items]                  
Line of credit, principal amount $ 396,000,000                
Basis spread on variable rate decrease in floor (0.75%)                
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Facility [Member]                  
Line of Credit Facility [Line Items]                  
Basis spread on variable rate         1.00%        
Minimum [Member] | Base Rate [Member] | Term Facility [Member]                  
Line of Credit Facility [Line Items]                  
Basis spread on variable rate         2.00%