CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Performance-based stock awards	Common stock	Additional Paid-in Capital	Additional Paid-in Capital Performance-based stock awards	Accumulated Deficit	Treasury Stock
Beginning Balance at Dec. 31, 2011	$ 126,778		$ 217	$ 201,284		$ (63,987)	$ (10,736)
Beginning balance, shares outstanding at Dec. 31, 2011			18,427,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	11,389					11,389
Isuuance of common stock, shares			151,000
Issuance of common stock	844		1	843
Exercise of stock options, shares	81,000		81,000
Exercise of stock options	437		1	436
Issuance of restricted common stock, shares			379,000
Issuance of restricted common stock	22		4	18
Cancellation and retirement of restricted common stock, shares			(196,000)
Cancellation and retirement of restricted common stock	(434)		(2)	(432)
Accelerated vesting of restricted common stock and options	281			281
Amortization of restricted common stock	1,370			1,370
Stock-based compensation expense	466			466
Treasury stock acquired, shares			(686,000)
Treasury stock acquired	(4,531)						(4,531)
Dividends on common stock	(1,804)			(1,804)
Ending Balance at Dec. 31, 2012	134,818		221	202,462		(52,598)	(15,267)
Ending balance, shares outstanding at Dec. 31, 2012			18,156,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	19,292					19,292
Isuuance of common stock, shares			114,000
Issuance of common stock	1,394		1	1,393
Exercise of stock options, shares	45,000		45,000
Exercise of stock options	0		0	0
Issuance of restricted common stock, shares			63,000
Issuance of restricted common stock	1		1	0
Cancellation and retirement of restricted common stock, shares			(117,000)
Cancellation and retirement of restricted common stock	(1,631)		(1)	(1,630)
Accelerated vesting of restricted common stock and options	667			667
Amortization of restricted common stock	1,340			1,340
Stock-based compensation expense	1,296			1,296
Dividends on common stock	(1,817)			(1,817)
Excess tax benefits on equity compensation	613			613
Ending Balance at Dec. 31, 2013	155,973		222	204,324		(33,306)	(15,267)
Ending balance, shares outstanding at Dec. 31, 2013			18,261,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	15,838					15,838
Isuuance of common stock, shares			70,000
Issuance of common stock	1,110		0	1,110
Exercise of stock options, shares	68,000		68,000
Exercise of stock options	363		0	363
Issuance of restricted common stock, shares			200,000
Issuance of restricted common stock	0		2	(2)
Cancellation and retirement of restricted common stock, shares			(87,000)
Cancellation and retirement of restricted common stock	(1,357)		0	(1,357)
Accelerated vesting of restricted common stock and options	27			27
Amortization of restricted common stock	1,806			1,806
Stock-based compensation expense	2,616	(16,624)		2,616	(16,624)
Convertible subordinated notes due 2021	17,973			17,973
Treasury stock acquired, shares	0
Dividends on common stock	(1,840)			(1,840)
Excess tax benefits on equity compensation	3,990			3,990
Ending Balance at Dec. 31, 2014	$ 179,875		$ 224	$ 212,386		$ (17,468)	$ (15,267)
Ending balance, shares outstanding at Dec. 31, 2014			18,512,000