CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares		1 Months Ended		3 Months Ended	12 Months Ended
	Dec. 31, 2017	Oct. 31, 2018	Jan. 31, 2018	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends, per share (in dollars per share)	$ 0.05	$ 0.07	$ 0.06	$ 0.06	$ 0.25	$ 0.17	$ 0.08