CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2013	$ 936	$ 296,517	$ 250,000	$ (45,014)	$ 502,439
Balance (in shares) at Dec. 31, 2013	93,826,453			6,526,305
Increase (Decrease) in Shareholders' Equity
Net income and comprehensive income			9,391		9,391
Stock-based compensation cost		6,230			6,230
Exercise of stock options	3	3,073			3,076
Exercise of stock options (in shares)	316,041
Vesting of restricted stock awards and units, net of shares withheld for employee tax	1	(1,089)			(1,088)
Vesting of restricted stock awards and units, net of shares withheld for employee tax (in shares)	107,488
Deferred tax reversal for unexercised stock options		(395)			(395)
Excess tax benefit from exercise of stock options		854			854
Balance at Jun. 30, 2014	$ 940	$ 305,190	$ 259,391	$ (45,014)	$ 520,507
Balance (in shares) at Jun. 30, 2014	94,249,982			6,526,305