CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Tax benefit from exercise or vesting of equity awards, deferred tax asset deficiencies	$ 105	$ 77	$ 435
Cash dividends declared, per share	$ 0.12	$ 0.105	$ 0.06