CONSOLIDATED STATEMENTS OF STOCKHOLDER'S EQUITY (Parenthetical) |
12 Months Ended |
|---|---|
|
Dec. 31, 2018
$ / shares
| |
| Class A common stock | |
| Cash dividend declared (in dollars per share) | $ 0.20 |
| Class A common stock | Special dividends | |
| Cash dividend declared (in dollars per share) | 1.55 |
| Class B common stock | |
| Cash dividend declared (in dollars per share) | 0.20 |
| Class B common stock | Special dividends | |
| Cash dividend declared (in dollars per share) | $ 1.55 |