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Debt - Schedule Of Components Of Debt (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Jul. 21, 2015
Dec. 30, 2014
Jun. 27, 2012
Aug. 25, 2010
Debt Instrument [Line Items]            
Total debt $ 840,604,000 $ 814,136,000        
Less current portion 1,195,000 1,191,000        
Total long-term debt 839,409,000 812,945,000        
Senior Notes | $400 Million Senior Notes            
Debt Instrument [Line Items]            
Total debt $ 395,316,000 $ 394,618,000        
Debt instrument, face amount         $ 400,000,000  
Debt instrument effective interest rate 6.00% 6.00%     6.00%  
Deferred issuance costs $ 4,700,000 $ 5,400,000        
Senior Notes | $250 Million Senior Notes            
Debt Instrument [Line Items]            
Total debt $ 248,875,000 $ 248,568,000        
Debt instrument, face amount           $ 250,000,000
Debt instrument effective interest rate 6.19% 6.19%       6.19%
Discount and deferred issuance costs $ 1,100,000 $ 1,400,000        
Revolving Credit Facility | $450 Million Unsecured Revolving Credit Facility            
Debt Instrument [Line Items]            
Total debt $ 182,359,000 $ 156,025,000        
Debt instrument, face amount     $ 450,000,000      
Debt instrument effective interest rate 2.23% 2.17%        
Deferred issuance costs $ 2,600,000 $ 3,000,000        
Collateralized Mortgage            
Debt Instrument [Line Items]            
Total debt $ 9,432,000 $ 10,048,000        
Debt instrument effective interest rate 4.57% 4.57%        
Debt instrument, fair value adjustment $ 700,000 $ 900,000   $ 1,200,000    
Economic Development Loans            
Debt Instrument [Line Items]            
Total debt $ 3,712,000 $ 3,712,000        
Debt instrument effective interest rate 3.00% 3.00%        
Capital Lease Obligations            
Debt Instrument [Line Items]            
Total debt $ 0 $ 430,000        
Debt instrument effective interest rate 3.18% 3.18%        
Other Notes Payable            
Debt Instrument [Line Items]            
Total debt $ 910,000 $ 735,000