CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - 6 months ended Jun. 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			8,940		8,940
Stock-based compensation expense		7,068			7,068
Exercise of stock options	$ 6	3,406			3,412
Exercise of stock options (in shares)	472,097
Vesting of restricted stock units, net of shares withheld for employee tax	$ 1	(629)			(628)
Vesting of restricted stock units, net of shares withheld for employee tax (in shares)	95,231
Excess tax benefit from exercise of stock options		1,456			1,456
Shortfall due to exercise of stock options and vesting of restricted stock units		(335)			(335)
Deferred tax asset reversal for unexercised stock options		(868)			(868)
Balance at Jun. 30, 2015	$ 950	$ 323,312	$ 272,887	$ (45,014)	$ 552,135
Balance (in shares) at Jun. 30, 2015	95,078,772			6,526,305