CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Options exercised and awards vested in shares (in shares)	261,055	208,163	163,547
Treasury stock shares (in shares)	1,991,206		401,000