Consolidated Statement of Shareholders' Equity (Unaudited) - 3 months ended Mar. 31, 2016 - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balance (in shares) at Dec. 31, 2015	95,263,461			11,273,746
Balance at Dec. 31, 2015	$ 952	$ 330,290	$ 288,474	$ (95,014)	$ 524,702
Net income			4,560		4,560
Stock-based compensation expense		4,240			$ 4,240
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	9,975				10,000
Exercise of stock options		26			$ 26
Vesting of restricted stock units, net of shares withheld for employee tax (in shares)	132,718
Vesting of restricted stock units, net of shares withheld for employee tax	$ 2	(1,004)			(1,002)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation		10			10
Tax shortfall due to exercise of stock options and vesting of restricted stock units		(436)			(436)
Deferred tax asset reversal for unexercised stock options		(216)			(216)
Balance (in shares) at Mar. 31, 2016	95,406,154			11,273,746
Balance at Mar. 31, 2016	$ 954	$ 332,910	$ 293,034	$ (95,014)	$ 531,884