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Debt Schedule Of Components Of Debt (Details) - USD ($)
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Debt [Line Items]      
Less current portion $ 782,532,000   $ 726,524,000
Less current portion 1,099,000   1,232,000
Total long-term debt 781,433,000   725,292,000
Senior | $400 Million Senior Notes      
Debt [Line Items]      
Less current portion 396,643,000   396,057,000
Debt instrument face amount $ 400,000,000   $ 400,000,000
Debt instrument effective interest rate (percentage) 6.00%   6.00%
Deferred issuance costs $ 3,400,000   $ 3,900,000
Senior | $250 Million Senior Notes      
Debt [Line Items]      
Less current portion 249,412,000   249,182,000
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 $ 600,000   $ 800,000
Senior | $600 Million Unsecured Revolving Credit Facility      
Debt [Line Items]      
Less current portion 123,255,000   0
Debt instrument face amount $ 600,000,000    
Debt instrument effective interest rate (percentage) 3.20%    
Deferred issuance costs $ 3,100,000    
Senior | $450 Million Unsecured Revolving Credit Facility      
Debt [Line Items]      
Less current portion 0   67,936,000
Debt instrument face amount $ 450,000,000    
Debt instrument effective interest rate (percentage) 2.84%    
Deferred issuance costs     2,100,000
Collateralized Mortgage      
Debt [Line Items]      
Less current portion $ 8,364,000   $ 8,853,000
Debt instrument effective interest rate (percentage) 4.57%   4.57%
Fair value adjustment $ 400,000 $ 600,000  
Economic Development Loans      
Debt [Line Items]      
Less current portion $ 4,240,000   $ 3,712,000
Debt instrument effective interest rate (percentage) 3.00%   3.00%
Other Notes Payable      
Debt [Line Items]      
Less current portion $ 618,000   $ 784,000