Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total USD ($)	Common Stock USD ($)	Preferred Stock USD ($)	Treasury Stock USD ($)	Additional Paid-in Capital USD ($)	Accumulated Other Comprehensive Income (Loss) USD ($)	Retained Earnings (Accumulated Deficit) USD ($)	Secured Debt [Member] USD ($)	Secured Debt [Member] Common Stock	Secured Debt [Member] Additional Paid-in Capital USD ($)	Convertible Note [Member] USD ($)	Convertible Note [Member] Common Stock	Convertible Note [Member] Additional Paid-in Capital USD ($)
Beginning balance at Dec. 31, 2010	$ (3,453)	$ 4	$ 7,280	$ (892)	$ 103,408	$ 97	$ (113,350)
Beginning balance, shares at Dec. 31, 2010		36,754,000	11,000	565,000
Increase (Decrease) in Stockholders' Equity
Net income	31,408						31,408
Foreign currency translation adjustment	(141)					(141)
Fair value of warrant liability reclassified to additional paid-in capital	0
Sale of common stock, net of issuance cost	29,438				29,438
Sale of common stock, net of issuance cost, shares		3,665,000
Common stock issued in payment of debt								1,398		1,398	5,165		5,165
Common stock issued in payment of debt, shares									171,000			559,000
Accretion of discount on preferred stock			3,925				(3,925)
Common stock issued in payment of preferred dividends, shares		624,000
Preferred stock dividends, net of forfeitures	(3,254)				(3,254)
Dividends, Preferred Stock, Cash	943						943
Stock warrants exercised	4,793				4,793
Stock warrants exercised, shares		3,961,000
Stock options exercised	147				147
Stock options exercised, shares		64,000
Restricted stock granted, shares		1,288,000
Restricted stock forfeited, shares				11,000
Treasury stock purchased	(775)			(775)
Treasury stock purchased, shares				81,000
Excess tax benefit related to share-based awards	570				570
Stock compensation expense	7,437				7,437
Conversion of preferred stock into common stock		1	(11,205)		11,204
Conversion of preferred stock into common stock, shares	4,871,719	4,872,000	11,000
Return of borrowed shares under share lending agreement				701,000
Ending balance at Dec. 31, 2011	78,298	5	0	(1,667)	166,814	(44)	(86,810)
Ending balance, shares at Dec. 31, 2011		51,958,000	0	1,358,000
Increase (Decrease) in Stockholders' Equity
Net income	49,791						49,791
Foreign currency translation adjustment	4					4
Fair value of warrant liability reclassified to additional paid-in capital	13,973				13,973
Stock warrants exercised	421				421
Stock warrants exercised, shares	348,350	348,000
Stock options exercised	167				167
Stock options exercised, shares	67,500	68,000
Restricted stock granted, shares	750,476	750,000
Restricted stock forfeited, shares				30,000
Treasury stock purchased	(2,034)			(2,034)
Treasury stock purchased, shares	166,334			166,000
Excess tax benefit related to share-based awards	528				528
Employee stock purchase plan	161				161
Employee stock purchase plan, shares				(15,000)
Stock compensation expense	13,421				13,421
Stock issued in Florida Chemical Company acquisition, shares	0
Return of borrowed shares under share lending agreement				659,000
Ending balance at Dec. 31, 2012	154,730	5	0	(3,701)	195,485	(40)	(37,019)
Ending balance, shares at Dec. 31, 2012		53,124,000	0	2,198,000
Increase (Decrease) in Stockholders' Equity
Net income	36,178						36,178
Foreign currency translation adjustment	(319)					(319)
Issuance costs of preferred stock and detachable warrants	(200)				(200)
Fair value of warrant liability reclassified to additional paid-in capital	0
Common stock issued in payment of debt, shares	43.9560
Stock warrants exercised	323				323
Stock warrants exercised, shares	267,000	267,000
Stock options exercised	4,397				4,397
Stock options exercised, shares	571,500	572,000		0
Stock surrendered for exercise of stock options	(3,907)			(3,907)
Stock surrendered for exercise of stock options, shares				237,000
Restricted stock granted, shares	802,164	802,000
Restricted stock forfeited, shares				115,000
Stock granted in incentive performance plan, shares		217,000
Treasury stock purchased	(7,568)			(7,568)
Treasury stock purchased, shares	448,121			448,000
Excess tax benefit related to share-based awards	1,668				1,668
Employee stock purchase plan	824				824
Employee stock purchase plan, shares				(44,000)
Stock compensation expense	10,914				10,914
Stock issued in Florida Chemical Company acquisition	52,712	1			52,711
Stock issued in Florida Chemical Company acquisition, shares	3,284,180	3,284,000
Return of borrowed shares under share lending agreement				2,440,000
Ending balance at Dec. 31, 2013	$ 249,752	$ 6	$ 0	$ (15,176)	$ 266,122	$ (359)	$ (841)
Ending balance, shares at Dec. 31, 2013		58,266,000	0	5,394,000