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Debt Schedule Of Components Of Debt (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Jul. 21, 2015
Jun. 27, 2012
Aug. 25, 2010
Debt [Line Items]          
Total debt $ 801,303,000 $ 840,604,000      
Less current portion 1,302,000 1,195,000      
Total long-term debt 800,001,000 839,409,000      
Senior | $400 Million Senior Notes          
Debt [Line Items]          
Total debt 395,868,000 395,316,000      
Debt instrument face amount $ 400,000,000 $ 400,000,000   $ 400,000,000  
Debt instrument effective interest rate (percentage) 6.00% 6.00%   6.00%  
Deferred issuance costs $ 4,100,000 $ 4,700,000      
Senior | $250 Million Senior Notes          
Debt [Line Items]          
Total debt 249,105,000 248,875,000      
Debt instrument face amount $ 250,000,000 $ 250,000,000     $ 250,000,000
Debt instrument effective interest rate (percentage) 6.19% 6.19%     6.19%
Discount and deferred issuance costs $ 900,000 $ 1,100,000      
Revolving Credit Facility | $450 Million Unsecured Revolving Credit Facility          
Debt [Line Items]          
Total debt 142,791,000 182,359,000      
Debt instrument face amount $ 450,000,000 $ 450,000,000 $ 450,000,000    
Debt instrument effective interest rate (percentage) 2.59% 2.23%      
Deferred issuance costs $ 2,200,000 $ 2,600,000      
Collateralized mortgage          
Debt [Line Items]          
Total debt $ 8,961,000 $ 9,432,000      
Debt instrument effective interest rate (percentage) 4.57% 4.57%      
Fair value adjustment $ 600,000 $ 700,000      
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 $ 866,000 $ 910,000