CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Stockholders' Equity [Abstract]
Other Comprehensive Income (Loss), Tax	$ 467	$ 124
Vesting of restricted stock units and other (in shares)	102,695	7,254
Stock Appreciation Rights exercise (in shares)	2,560