CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - 9 months ended Sep. 30, 2015 - USD ($) $ in Thousands	Common Stock	Capital in Excess of Par Value	Retained Earnings	Treasury Stock	Total
Balance at Dec. 31, 2014	$ 943	$ 313,214	$ 263,947	$ (45,014)	$ 533,090
Balance (in shares) at Dec. 31, 2014	94,511,444			6,526,305
Increase (Decrease) in Shareholders' Equity
Net income and comprehensive income			15,802		15,802
Stock-based compensation expense		10,208			10,208
Purchase of treasury stock				$ (25,000)	(25,000)
Purchase of treasury stock (in shares)				2,652,065
Exercise of stock options	$ 7	4,181			4,188
Exercise of stock options (in shares)	577,559
Vesting of restricted stock units, net of shares withheld for employee tax	$ 1	(636)			(635)
Vesting of restricted stock units, net of shares withheld for employee tax (in shares)	97,704
Excess tax benefit from exercise of stock options		1,477			1,477
Shortfall due to exercise of stock options and vesting of restricted stock units		(384)			(384)
Deferred tax asset reversal for unexercised stock options		(976)			(976)
Balance at Sep. 30, 2015	$ 951	$ 327,084	$ 279,749	$ (70,014)	$ 537,770
Balance (in shares) at Sep. 30, 2015	95,186,707			9,178,370