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Long Term Debt (Details) - USD ($)
6 Months Ended
Jan. 04, 2016
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Debt Instrument [Line Items]        
Long-term Debt   $ 518,784,000   $ 270,810,000
Long-term Debt, Current Maturities   10,145,000   1,339,000
Long-term Debt, Excluding Current Maturities   508,639,000   269,471,000
Unamortized Debt Issuance Expense   $ 700,000   0
Effective interest rate (percentage)   2.47%    
Debt Instrument, Financing Costs Expensed   $ 2,700,000    
Loss on early extinguishment of debt   254,000 $ 0  
Remaining borrowing capacity   175,900,000    
Letters of Credit Outstanding, Amount   4,800,000    
Maturities of Long-term Debt [Abstract]        
July 1, 2016 - June 30, 2017   10,145,000    
July 1, 2017 - June 30, 2018   12,449,000    
July 1, 2018 - June 30, 2019   16,951,000    
July 1, 2019 - June 30, 2020   17,500,000    
July 1, 2020 - June 30, 2021   462,439,000    
Amended and Restated Senior Credit Agreement [Member] | Base Rate [Member]        
Debt Instrument [Line Items]        
Variable rate (percentage) 1.00%      
Amended and Restated Senior Credit Agreement [Member] | Eurodollar [Member]        
Debt Instrument [Line Items]        
Variable rate (percentage) 2.00%      
Loans Payable [Member]        
Debt Instrument [Line Items]        
Long-term Debt   169,925,000   0
Long-term Debt, Gross   170,600,000    
Loans Payable [Member] | Amended and Restated Senior Credit Agreement [Member]        
Debt Instrument [Line Items]        
Face amount $ 175,000,000      
Line of Credit [Member]        
Debt Instrument [Line Items]        
Long-term Debt   344,314,000   265,609,000
Line of Credit [Member] | Amended and Restated Senior Credit Agreement [Member]        
Debt Instrument [Line Items]        
Borrowing capacity $ 525,000,000      
Mortgages [Member]        
Debt Instrument [Line Items]        
Long-term Debt   $ 4,545,000   $ 5,201,000
Debt Instrument, Interest Rate, Stated Percentage   8.25%