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Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 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	691	873
Exercise of stock options by common stock surrender	2,418	0
Supplemental cash payment information:
Interest paid	780	2,950
Income taxes paid	$ 10,157	$ 8,574

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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