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Debt Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 05, 2017
Jun. 24, 2014
Line of credit facility, maximum borrowing capacity         $ 375,000 $ 200,000
Borrowings under Term Loan         178,500  
Line of Credit Facility Accordion Feature         200,000  
Line of credit facility, outstanding borrowings         0  
Proceeds from New Borrowings   $ 18,000 $ 18,000 $ 0    
Line of Credit Facility, Commitment Fee Percentage 0.125%          
Line of credit facility, current borrowing capacity $ 197,000 $ 197,000 $ 197,000      
SwingLine [Member]            
Line of credit facility, maximum borrowing capacity         $ 25,000