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Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Short-term debt:    
Bank Credit Facility, expires July 30, 2019 $ 0 $ 0
Long-term debt, current and noncurrent:    
Long-term debt 247,273 247,209
4.50% Senior Notes [Member]    
Long-term debt, current and noncurrent:    
Long-term debt $ 247,273 $ 247,209