UNAUDITED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement Of Stockholders Equity [Abstract]
Cash dividends declared per common share	$ 0.175	$ 0.125
Issuance of common shares for acquisition, net of issuance costs	49,232,008
Issuance of common shares for restricted stock unit vesting	34,587