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	8,729			8,729
Other comprehensive (loss), net of income tax	(714)				(714)
Equity award vesting	0		(7,076)			$ 7,076
Equity award vesting (in shares)						120
Tax benefit from equity awards	(4,388)		(4,388)
Stock-based compensation	7,529		7,529
Shares tendered for taxes	(912)					$ (912)
Shares tendered for taxes (in shares)						(42)
Issuance of shares for Director's compensation	38			(32)		$ 70
Issuance of shares for Director's compensation (in shares)						1
Ending Balance at Sep. 30, 2014	125,928	$ 371	196,105	949,146	2,432	$ (1,022,126)
Ending Balance (in shares) at Sep. 30, 2014		37,069				(13,620)
Net income	14,591			14,591
Other comprehensive (loss), net of income tax	(1,231)				(1,231)
Equity award vesting	0		(8)			$ 8
Equity award vesting (in shares)						1
Tax benefit from equity awards	(21)		(21)
Stock-based compensation	2,807		2,807
Shares tendered for taxes	(2)
Shares tendered for taxes (in shares)						(2)
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	12,851			12,851
Other comprehensive (loss), net of income tax	(714)				(714)
Equity award vesting	0		(16,809)			$ 16,809
Equity award vesting (in shares)						334
Tax benefit from equity awards	(6,638)		(6,638)
Stock-based compensation	4,526		4,526
Shares tendered for taxes	(672)		(40)			$ (632)
Shares tendered for taxes (in shares)						(112)
Issuance of shares for Director's compensation	206			188		$ 18
Issuance of shares for Director's compensation (in shares)						2
Ending Balance at Sep. 30, 2015	$ 151,631	$ 371	$ 179,922	$ 976,776	$ 487	$ (1,005,925)
Ending Balance (in shares) at Sep. 30, 2015		37,069				(13,395)