CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares						3 Months Ended		6 Months Ended
	Jun. 15, 2017	Mar. 14, 2017	Dec. 21, 2016	Oct. 11, 2016	Aug. 23, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Stockholders' Equity
Dividends declared per share of common stock	$ 0.37	$ 0.37	$ 0.35	$ 0.36	$ 0.45	$ 0.37	$ 0.45	$ 0.74	$ 0.45