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Debt Schedule Of Components Of Debt (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Debt [Line Items]      
Total debt $ 797,010,000   $ 726,524,000
Less current portion 1,265,000   1,232,000
Total long-term debt 795,745,000   725,292,000
Senior | $400 Million Senior Notes      
Debt [Line Items]      
Total debt 396,249,000   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 $ 3,800,000   $ 3,900,000
Senior | $250 Million Senior Notes      
Debt [Line Items]      
Total debt 249,259,000   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 $ 700,000   $ 800,000
Senior Revolving Credit Facility | $450 Million Unsecured Revolving Credit Facility      
Debt [Line Items]      
Total debt 138,080,000   67,936,000
Debt instrument face amount $ 450,000,000   $ 450,000,000
Debt instrument effective interest rate (percentage) 3.14%   2.84%
Deferred issuance costs $ 1,900,000   $ 2,100,000
Collateralized Mortgage      
Debt [Line Items]      
Total debt $ 8,692,000   $ 8,853,000
Debt instrument effective interest rate (percentage) 4.57%   4.57%
Fair value adjustment $ 500,000 $ 600,000  
Economic Development Loans      
Debt [Line Items]      
Total debt $ 3,712,000   $ 3,712,000
Debt instrument effective interest rate (percentage) 3.00%   3.00%
Other Notes Payable      
Debt [Line Items]      
Total debt $ 1,018,000   $ 784,000