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	4,014			4,014
Other comprehensive (loss), net of income tax	(476)				(476)
Equity award vesting	0		(2,878)			$ 2,878
Equity award vesting (in shares)						52
Tax benefit from equity awards	(3,218)		(3,218)
Stock-based compensation	4,862		4,862
Shares tendered for taxes	(728)					$ (728)
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 Jun. 30, 2014	120,138	$ 371	198,806	944,431	2,670	$ (1,026,140)
Ending Balance (in shares) at Jun. 30, 2014		37,069				(13,665)
Net income	25,239			25,239
Other comprehensive (loss), net of income tax	(1,469)				(1,469)
Equity award vesting	0		(4,206)			$ 4,206
Equity award vesting (in shares)						69
Tax benefit from equity awards	(1,191)		(1,191)
Stock-based compensation	5,474		5,474
Shares tendered for taxes	(186)					$ (186)
Shares tendered for taxes (in shares)						(23)
Ending Balance at Dec. 31, 2014	148,005	$ 371	198,883	969,670	1,201	$ (1,022,120)
Ending Balance (in shares) at Dec. 31, 2014		37,069				(13,619)
Net income	11,163			11,163
Other comprehensive (loss), net of income tax	(476)				(476)
Equity award vesting	0		(9,290)			$ 9,290
Equity award vesting (in shares)						198
Tax benefit from equity awards	(6,352)		(6,352)
Stock-based compensation	3,260		3,260
Shares tendered for taxes	(505)					$ (505)
Shares tendered for taxes (in shares)						(70)
Ending Balance at Jun. 30, 2015	$ 155,095	$ 371	$ 186,501	$ 980,833	$ 725	$ (1,013,335)
Ending Balance (in shares) at Jun. 30, 2015		37,069				(13,491)