Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock options exercised, shares	60	147	191
RSUs and restricted stock vested, shares	34	35	26
Purchase of treasury stock, shares	3,967	3,669	5,608
Treasury Stock [Member]
Purchase of treasury stock, shares	3,967	3,669	5,608