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Amended and Restated Senior Credit Agreement (Details) - USD ($)
3 Months Ended
Jan. 04, 2016
Mar. 31, 2016
Mar. 31, 2015
Debt Instrument [Line Items]      
Effective interest rate (percentage)   2.43%  
Debt Instrument, Financing Costs Expensed   $ 2,700,000  
Loss on early extinguishment of debt   254,000 $ 0
Remaining borrowing capacity   175,500,000  
Letters of Credit Outstanding, Amount   5,100,000  
Maturities of Long-term Debt [Abstract]      
April 1, 2016 - March 31, 2017   10,089,000  
April 1, 2017 - March 31, 2018   11,296,000  
April 1, 2018 - March 31, 2019   15,792,000  
April 1, 2019 - March 31, 2020   18,336,000  
April 1, 2020 - March 31, 2021   466,920,000  
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   172,800,000  
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   $ 344,400,000  
Line of Credit [Member] | Amended and Restated Senior Credit Agreement [Member]      
Debt Instrument [Line Items]      
Borrowing capacity $ 525,000,000