CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Common stock (temporary equity), par value (in dollars per share) | $ 0.01 | $ 0.01 |
| Common stock (temporary equity), shares issued (in shares) | 140,014 | 167,211 |
| Common stock (temporary equity), shares outstanding (in shares) | 103,245 | 130,442 |
| Treasury stock, shares | 36,769 | 36,769 |
| Class A Common Stock | ||
| Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |
| Common stock, share authorized (in shares) | 524,173,073 | 524,173,073 |
| Common stock, shares issued (in shares) | 34,236,561 | 21,445,090 |
| Common stock, shares outstanding (in shares) | 34,236,561 | 21,445,090 |
| Class B Common Stock | ||
| Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |
| Common stock, share authorized (in shares) | 75,826,927 | 75,826,927 |
| Common stock, shares issued (in shares) | 75,826,927 | 75,826,927 |
| Common stock, shares outstanding (in shares) | 75,826,927 | 75,826,927 |