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Debt Schedule Of Components Of Debt (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Jul. 21, 2015
Jun. 27, 2012
Aug. 25, 2010
Debt [Line Items]          
Total debt $ 866,907,000 $ 814,136,000      
Less current portion 660,000 1,191,000      
Total long-term debt 866,247,000 812,945,000      
Senior | $400 Million Senior Notes          
Debt [Line Items]          
Total debt 395,138,000 394,618,000      
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 $ 4,900,000 $ 5,400,000      
Senior | $250 Million Senior Notes          
Debt [Line Items]          
Total debt 248,799,000 248,568,000      
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 $ 1,200,000 $ 1,400,000      
Revolving Credit Facility | $450 Million Unsecured Revolving Credit Facility          
Debt [Line Items]          
Total debt 209,215,000 156,025,000      
Debt instrument face amount $ 450,000,000 $ 450,000,000 $ 450,000,000    
Debt instrument effective interest rate (percentage) 2.03% 1.87%      
Deferred issuance costs $ 2,800,000 $ 3,000,000      
Collateralized mortgage          
Debt [Line Items]          
Total debt $ 9,588,000 $ 10,048,000      
Debt instrument effective interest rate (percentage) 4.57% 4.57%      
Fair value adjustment $ 800,000 $ 900,000      
Economic Development Loans          
Debt [Line Items]          
Total debt $ 3,712,000 $ 3,712,000      
Debt instrument effective interest rate (percentage) 3.00% 3.00%      
Capital Lease Obligations          
Debt [Line Items]          
Total debt $ 0 $ 430,000      
Debt instrument effective interest rate (percentage) 3.18% 3.18%      
Other Notes Payable          
Debt [Line Items]          
Total debt $ 455,000 $ 735,000