Consolidated Statements of Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]
Tax benefit of stock based compensation plans	$ 274	$ 4,323	$ 1,268
Dividends paid (in dollars per share)	$ 0.42	$ 0.42	$ 0.42