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Debt - Schedule Of Components Of Debt (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jun. 27, 2012
Aug. 25, 2010
Debt Instrument [Line Items]        
Total debt $ 754,611,000 $ 726,524,000    
Less current portion 1,097,000 1,232,000    
Total long-term debt 753,514,000 725,292,000    
Senior Notes | $400 Million Senior Notes        
Debt Instrument [Line Items]        
Total debt 396,844,000 396,057,000    
Debt instrument, face amount $ 400,000,000 $ 400,000,000 $ 400,000,000  
Debt instrument effective interest rate 6.00% 6.00% 6.00%  
Deferred issuance costs $ 3,200,000 $ 3,900,000    
Senior Notes | $250 Million Senior Notes        
Debt Instrument [Line Items]        
Total debt 249,489,000 249,182,000    
Debt instrument, face amount $ 250,000,000 $ 250,000,000   $ 250,000,000
Debt instrument effective interest rate 6.19% 6.19%   6.19%
Discount and deferred issuance costs $ 500,000 $ 800,000    
Senior Notes | $600 Million Senior Note        
Debt Instrument [Line Items]        
Total debt 87,582,000 0    
Debt instrument, face amount $ 600,000,000      
Debt instrument effective interest rate 3.50%      
Deferred issuance costs $ 3,000,000      
Senior Notes | $450 Million Senior Note        
Debt Instrument [Line Items]        
Total debt 0 67,936,000    
Debt instrument, face amount   $ 450,000,000    
Debt instrument effective interest rate   2.84%    
Deferred issuance costs   $ 2,100,000    
Construction Loan        
Debt Instrument [Line Items]        
Total debt $ 7,652,000 0    
Debt instrument effective interest rate 6.70%      
Deferred issuance costs $ 900,000      
Collateralized Mortgage        
Debt Instrument [Line Items]        
Total debt $ 8,197,000 $ 8,853,000    
Debt instrument effective interest rate 4.57% 4.57%    
Fair value adjustment $ 400,000 $ 600,000    
Economic Development Loans        
Debt Instrument [Line Items]        
Total debt $ 4,240,000 $ 3,712,000    
Debt instrument effective interest rate 3.00% 3.00%    
Other Notes Payable        
Debt Instrument [Line Items]        
Total debt $ 607,000 $ 784,000