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Debt Narrative (Details)
Jul. 21, 2015
USD ($)
Apr. 30, 2013
USD ($)
Aug. 23, 2012
USD ($)
Jun. 27, 2012
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 30, 2014
USD ($)
Aug. 25, 2010
USD ($)
2012 special cash dividend | 2012 special cash dividend                
Debt [Line Items]                
Payments of special dividends     $ 600,700,000          
Collateralized mortgage                
Debt [Line Items]                
Debt instrument stated interest rate (percentage)             7.26%  
Debt instrument effective interest rate (percentage)         4.57% 4.57%    
Collateralized mortgage             $ 9,500,000  
Collateralized mortgage, future balloon payment             6,900,000  
Debt premium             $ 1,200,000  
Economic Development Loans                
Debt [Line Items]                
Debt instrument stated interest rate (percentage)         3.00%      
Debt instrument effective interest rate (percentage)         3.00% 3.00%    
Economic development agreements - total advances agreed upon   $ 4,400,000            
Economic development agreements - advances received         $ 3,700,000      
Economic development agreements - advances not yet received         700,000      
Economic development agreements - term   10 years            
$400 Million Senior Notes | Senior                
Debt [Line Items]                
Debt instrument face amount       $ 400,000,000 $ 400,000,000 $ 400,000,000    
Debt instrument stated interest rate (percentage)       5.75%        
Debt instrument effective interest rate (percentage)       6.00% 6.00% 6.00%    
Debt instrument maturity date       Jul. 01, 2022        
$250 Million Senior Notes | Senior                
Debt [Line Items]                
Debt instrument face amount         $ 250,000,000 $ 250,000,000   $ 250,000,000
Debt instrument stated interest rate (percentage)               5.70%
Debt instrument effective interest rate (percentage)         6.19% 6.19%   6.19%
Senior notes, discount               $ 600,000
$450 Million Unsecured Revolving Credit Facility | Revolving Credit Facility                
Debt [Line Items]                
Debt instrument face amount $ 450,000,000       $ 450,000,000 $ 450,000,000    
Debt instrument effective interest rate (percentage)         2.03% 1.87%    
Option to extend, term 1 year              
Debt instrument additional borrowing capacity $ 150,000,000              
Credit facility, unused capacity, commitment fee percentage 0.20%              
$450 Million Unsecured Revolving Credit Facility | Revolving Credit Facility | Minimum                
Debt [Line Items]                
Credit facility, commitment fee percentage 0.10%              
Total leverage ratio 4              
Fixed charge coverage ratio 2.5              
$450 Million Unsecured Revolving Credit Facility | Revolving Credit Facility | Maximum                
Debt [Line Items]                
Credit facility, commitment fee percentage 0.25%              
Total leverage ratio 4.5              
$450 Million Unsecured Revolving Credit Facility | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum                
Debt [Line Items]                
Debt instrument, basis spread on variable rate (percentage) 1.35%              
$450 Million Unsecured Revolving Credit Facility | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum                
Debt [Line Items]                
Debt instrument, basis spread on variable rate (percentage) 1.75%              
$450 Million Unsecured Revolving Credit Facility | Revolving Credit Facility | Base rate | Minimum                
Debt [Line Items]                
Debt instrument, basis spread on variable rate (percentage) 0.35%              
$450 Million Unsecured Revolving Credit Facility | Revolving Credit Facility | Base rate | Maximum                
Debt [Line Items]                
Debt instrument, basis spread on variable rate (percentage) 0.75%              
$450 Million Unsecured Revolving Credit Facility | Revolving Credit Facility | Total Leverage Ratio exceeds 4.00 to 1.00                
Debt [Line Items]                
Credit facility, dividend restriction $ 50,000,000              
$450 Million Unsecured Revolving Credit Facility | Revolving Credit Facility | Alternative currency loans                
Debt [Line Items]                
Revolver maximum borrowing capacity 35,000,000              
$450 Million Unsecured Revolving Credit Facility | Revolving Credit Facility | Swing line loans                
Debt [Line Items]                
Revolver maximum borrowing capacity $ 15,000,000