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Debt Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jun. 24, 2014
Borrowings under credit agreement $ 191,250 $ 216,750   $ 255,000
Line of credit facility, maximum borrowing capacity       200,000
Line of credit, outstanding borrowings       $ 0
Line of credit facility, current borrowing capacity 200,000      
Term loan quarterly payments, next twelve months 25,500      
Term loan quarterly payments, year two 55,800      
Term loan quarterly payments, year three 110,000      
Payments on debt $ 25,500 $ 25,500 $ 34,000  
Loans Payable [Member]        
Term loan spread basis points 1.125%      
Line of Credit [Member]        
Line of credit facility, facility fee basis points 0.125%      
Line of credit facility spread basis points 1.00%