CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Statement of Stockholders' Equity [Abstract]
Other Comprehensive Income (Loss), Tax	$ (3,442)	$ 1,671
Vesting of restricted stock units and other (in shares)	369,498	236,335
Stock Appreciation Rights exercise (in shares)	22,584	7,441