CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Comprehensive Income	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Treasury Stock
Balance at Dec. 31, 2012	$ 82,922		$ 122	$ 903,692	$ (811,480)	$ (9,412)
Balance (in shares) at Dec. 31, 2012			12,195,000			1,188,000
Increase (Decrease) in Stockholders' Equity
Net income and comprehensive income	3,947	$ 3,947			3,947
Non-cash compensation	5,629			5,629
Purchase of treasury stock	$ (3,321)					$ (3,321)
Purchase of treasury stock (in shares)	180,453					181,000
Dividends	$ 637			637
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes	(2,806)		$ 4	(2,810)
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes (in shares)			425,000
Balance at Dec. 31, 2013	87,008		$ 126	907,148	(807,533)	$ (12,733)
Balance (in shares) at Dec. 31, 2013			12,620,000			1,369,000
Increase (Decrease) in Stockholders' Equity
Net income and comprehensive income	9,362	9,362			9,362
Non-cash compensation	7,446			7,446
Purchase of treasury stock	$ (2,610)					$ (2,610)
Purchase of treasury stock (in shares)	99,345					99,000
Dividends	$ (28)			(28)
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes	(4,812)		$ 3	(4,815)
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes (in shares)			235,000
Balance at Dec. 31, 2014	96,366		$ 129	909,751	(798,171)	$ (15,343)
Balance (in shares) at Dec. 31, 2014			12,855,000			1,468,000
Increase (Decrease) in Stockholders' Equity
Net income and comprehensive income	48,047	$ 48,047			48,047
Non-cash compensation	8,508			8,508
Purchase of treasury stock	$ (218)					$ (218)
Purchase of treasury stock (in shares)	5,250					6,000
Dividends	$ (11)			(11)
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes	(7,613)		$ 1	(7,614)
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes (in shares)			158,000
Tax benefit from stock-based award activity	4,601			4,601
Proceeds from equity offering, net of offering costs	91,462		$ 9	91,453
Issuance of stock for equity offering (in shares)			853,000
Balance at Dec. 31, 2015	$ 241,142		$ 139	$ 1,006,688	$ (750,124)	$ (15,561)
Balance (in shares) at Dec. 31, 2015			13,866,000			1,474,000