Unaudited Consolidated Statement of Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance at Dec. 31, 2012	$ 154,730	$ 5	$ (3,701)	$ 195,485	$ (40)	$ (37,019)
Beginning balance, shares at Dec. 31, 2012		53,124	2,198
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	25,173					25,173
Other comprehensive loss	(161)				(161)
Issuance costs of preferred stock and detachable warrants	(200)			(200)
Stock warrants exercised	323			323
Stock warrants exercised, shares		267
Stock options exercised	3,469			3,469
Stock options exercised, shares		472
Stock surrendered for exercise of stock options	(2,979)		(2,979)
Stock surrendered for exercise of stock options, shares			191
Restricted stock granted, shares		794
Restricted stock forfeited, shares			62
Stock granted in incentive performance plan, shares		217
Treasury stock purchased	(5,325)		(5,325)
Treasury stock purchased, shares			339
Excess tax benefit related to share-based awards	835			835
Employee stock purchase plan	567			567
Employee stock purchase plan, shares			(32)
Stock compensation expense	8,697			8,697
Stock issued in Florida Chemical Company acquisition	52,712	1		52,711
Stock issued in Florida Chemical Company acquisition, shares		3,284
Return of borrowed shares under share lending agreement			2,440
Ending balance at Sep. 30, 2013	$ 237,841	$ 6	$ (12,005)	$ 261,887	$ (201)	$ (11,846)
Ending balance, shares at Sep. 30, 2013		58,158	5,198