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Debt (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Notes payable:    
Uncommitted lines of credit $ 62,281 $ 43,062
Other 824 729
Short-term Debt 63,105 43,791
Long-term debt:    
Credit facility 251,040 239,000
Senior notes 225,000 225,000
Industrial development revenue bonds 11,900 11,900
Other 2,492 4,342
Long-term debt $ 490,432 $ 480,242