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Debt (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Notes payable - current:    
Uncommitted lines of credit $ 78,255 $ 43,062
Other 713 729
Short-term Debt 78,968 43,791
Long-term debt:    
Credit facility 216,125 239,000
Senior notes 225,000 225,000
Industrial development revenue bonds 11,900 11,900
Other 4,051 4,342
Long-term debt $ 457,076 $ 480,242