Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical)

v3.10.0.1
Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Class A Common Stock    
Common stock dividends, per share $ 0.42 $ 0.36