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Debt - Schedule Of Components Of Debt (Details) - USD ($)
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Debt [Line Items]      
Less current portion $ 784,788,000   $ 754,611,000
Less current portion 508,000   1,097,000
Total long-term debt 784,280,000   753,514,000
Senior | $400 Million Senior Notes      
Debt [Line Items]      
Less current portion 397,255,000   396,844,000
Debt instrument face amount $ 400,000,000   $ 400,000,000
Debt instrument effective interest rate (percentage) 6.00%   6.00%
Deferred issuance costs $ 2,700,000   $ 3,200,000
Senior | $250 Million Senior Notes      
Debt [Line Items]      
Less current portion 249,642,000   249,489,000
Debt instrument face amount $ 250,000,000   $ 250,000,000
Debt instrument effective interest rate (percentage) 6.19%   6.19%
Discount and deferred issuance costs $ 400,000   $ 500,000
Senior | $600 Million Unsecured Revolving Credit Facility      
Debt [Line Items]      
Less current portion 97,311,000   87,582,000
Debt instrument face amount $ 600,000,000   $ 600,000,000
Debt instrument effective interest rate (percentage) 3.47%   3.47%
Deferred issuance costs $ 2,700,000   $ 3,000,000
Construction Loans      
Debt [Line Items]      
Less current portion $ 28,482,000   $ 7,652,000
Debt instrument effective interest rate (percentage) 6.80%   6.80%
Deferred issuance costs $ 700,000   $ 900,000
Collateralized Mortgage      
Debt [Line Items]      
Less current portion $ 7,858,000   $ 8,197,000
Debt instrument effective interest rate (percentage) 4.57%   4.57%
Fair value adjustment $ 300,000 $ 400,000  
Economic Development Loans      
Debt [Line Items]      
Less current portion $ 4,240,000   $ 4,240,000
Debt instrument effective interest rate (percentage) 3.00%   3.00%
Other Notes Payable      
Debt [Line Items]      
Less current portion $ 0   $ 607,000