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Debt Debt Table (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]    
Long-term Line of Credit, Noncurrent $ 178,000 $ 170,000
Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Interest Rate at Period End 3.107% 2.486%
Long-term Line of Credit, Noncurrent $ 160,000 $ 170,000
SwingLine [Member]    
Line of Credit Facility [Line Items]    
Long-term Line of Credit, Noncurrent $ 18,000 $ 0
Debt, Weighted Average Interest Rate [1] 3.216%  
[1] Represents the weighted-average interest rate for the period in which a balance is outstanding.