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Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2014
Dec. 31, 2013
Notes payable – current    
Uncommitted lines of credit $ 24,750 $ 43,062
Other 825 729
Short-term Debt 25,575 43,791
Long-term debt    
Credit facility 240,000 239,000
Senior notes 225,000 225,000
Industrial development revenue bonds 11,900 11,900
Other 2,894 4,342
Long-term debt $ 479,794 $ 480,242