Consolidated Statement of Shareholders' Equity (Unaudited) - 3 months ended Mar. 31, 2017 - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balance (in shares) at Dec. 31, 2016	95,966,852			12,414,078
Balance at Dec. 31, 2016	$ 959	$ 345,025	$ 326,110	$ (115,484)	$ 556,610
Net income			1,442		1,442
Stock-based compensation expense		5,386			$ 5,386
Exercise of stock options (in shares)	677				677
Exercise of stock options		2			$ 2
Vesting of restricted stock units, net of shares withheld for employee tax (in shares)	331,988
Vesting of restricted stock units, net of shares withheld for employee tax		(2,608)			(2,608)
Balance (in shares) at Mar. 31, 2017	96,299,517			12,414,078
Balance at Mar. 31, 2017	$ 959	$ 347,805	$ 327,552	$ (115,484)	$ 560,832