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Debt Schedule Of Components Of Debt (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Jun. 27, 2012
Aug. 25, 2010
Debt [Line Items]        
Total debt $ 902,185 $ 814,136    
Less current portion 833 1,191    
Total long-term debt 901,352 812,945    
Senior | $400 Million Senior Notes        
Debt [Line Items]        
Total debt $ 394,962 $ 394,618    
Debt instrument effective interest rate (percentage) 6.00% 6.00% 6.00%  
Deferred issuance costs $ 5,000 $ 5,400    
Senior | $250 Million Senior Notes        
Debt [Line Items]        
Total debt $ 248,722 $ 248,568    
Debt instrument effective interest rate (percentage) 6.19% 6.19%   6.19%
Discount and deferred issuance costs $ 1,300 $ 1,400    
Revolving Credit Facility | $450 Million Unsecured Revolving Credit Facility        
Debt [Line Items]        
Total debt $ 244,350 $ 156,025    
Debt instrument effective interest rate (percentage) 1.95% 1.87%    
Deferred issuance costs $ 2,700 $ 3,000    
Collateralized mortgage        
Debt [Line Items]        
Total debt $ 9,742 $ 10,048    
Debt instrument effective interest rate (percentage) 4.57% 4.57%    
Fair value adjustment $ 800 $ 900    
Economic Development Loans        
Debt [Line Items]        
Total debt $ 3,712 $ 3,712    
Debt instrument effective interest rate (percentage) 3.00% 3.00%    
Capital Lease Obligations        
Debt [Line Items]        
Total debt $ 62 $ 430    
Debt instrument effective interest rate (percentage) 3.18% 3.18%    
Other Notes Payable        
Debt [Line Items]        
Total debt $ 635 $ 735