Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]
Tax benefit, issuance of stock under purchase and equity compensation plans		$ 24	$ 7
Gain (loss) on reissuance of treasury stock	$ 4,396	$ 96
Shares repurchased (shares)	4,500,936	8,645,836	6,076,558
Dividends paid per share	$ 0.22	$ 0.2	$ 0.2