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Debt and Interest Rate Swap Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Jun. 24, 2014
USD ($)
Borrowings under credit agreement       $ 255,000
Term loan spread basis points 112.5      
Line of credit facility, maximum borrowing capacity       200,000
Line of credit, outstanding borrowings       $ 0
Line of credit facility, current borrowing capacity $ 200,000      
Line of credit facility, facility fee basis points 12.5      
Line of credit facility spread basis points 100      
Term loan quarterly payments, next twelve months $ 25,500      
Term loan quarterly payments, year two 25,500      
Term loan quarterly payments, year three 55,800      
Term loan quarterly payments, year four 110,000      
Payments on debt 25,500 $ 34,000 $ 42,500  
Term loan, annual fixed rate associated with the swap       3.521%
Amount of swap liability charged to Debt expense during the period $ 400 $ 4,700 $ 6,500