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Supplemental Cash Flow Information (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Supplemental non-cash investing and financing activities:    
Value of shares issued in acquisition of Florida Chemical $ 52,711 $ 0
Fair value of warrant liability reclassified to additional paid-in capital 0 13,973
Equipment acquired through capital leases 866 1,072
Exercise of stock options by common stock surrender 2,979 0
Supplemental cash payment information:    
Interest paid 1,410 4,357
Income taxes paid $ 13,343 $ 12,158