CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Common Stock in Treasury [Member]
Beginning Balance at Dec. 31, 2013	$ 115,646	$ 371	$ 200,040	$ 940,449	$ 3,146	$ (1,028,360)
Beginning Balance (in shares) at Dec. 31, 2013		37,069				(13,699)
Net income	759			759
Other comprehensive (loss), net of income tax	(238)				(238)
Equity award vesting	0		(2,845)			$ 2,845
Equity award vesting (in shares)						51
Tax benefit from equity awards	(1,792)		(1,792)
Stock-based compensation	2,551		2,551
Shares tendered for taxes	(721)					$ (721)
Shares tendered for taxes (in shares)						(19)
Issuance of shares for Director's compensation	38			(32)		$ 70
Issuance of shares for Director's compensation (in shares)						1
Ending Balance at Mar. 31, 2014	116,243	$ 371	197,954	941,176	2,908	$ (1,026,166)
Ending Balance (in shares) at Mar. 31, 2014		37,069				(13,666)
Net income	22,561			22,561
Other comprehensive (loss), net of income tax	(1,707)				(1,707)
Equity award vesting	0		(4,239)			$ 4,239
Equity award vesting (in shares)						70
Tax benefit from equity awards	(2,617)		(2,617)
Stock-based compensation	7,785		7,785
Shares tendered for taxes	(193)					$ (193)
Shares tendered for taxes (in shares)						(23)
Ending Balance at Dec. 31, 2014	142,072	$ 371	198,883	963,737	1,201	$ (1,022,120)
Ending Balance (in shares) at Dec. 31, 2014		37,069				(13,619)
Net income	10,447			10,447
Other comprehensive (loss), net of income tax	(238)				(238)
Equity award vesting	0		(9,056)			$ 9,056
Equity award vesting (in shares)						163
Tax benefit from equity awards	(5,787)		(5,787)
Stock-based compensation	1,896		1,896
Shares tendered for taxes	(467)					$ (467)
Shares tendered for taxes (in shares)						(60)
Ending Balance at Mar. 31, 2015	$ 147,923	$ 371	$ 185,936	$ 974,184	$ 963	$ (1,013,531)
Ending Balance (in shares) at Mar. 31, 2015		37,069				(13,516)