Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical)

v3.8.0.1
CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Of Stockholders Equity [Abstract]      
Dividends paid to stockholders, per share $ 1.16 $ 1.08 $ 1.00
Gain realized on available-for-sale securities, taxes   $ 1,180