Equity Compensation (Restricted Stock Units) (Details) - Restricted stock units |
6 Months Ended |
|---|---|
|
Jun. 30, 2018
$ / shares
shares
| |
| Restricted stock units | |
| Non-vested balance at beginning of period (in shares) | 1,290,660 |
| Awarded | 436,750 |
| Vested | (581,886) |
| Forfeited | (34,250) |
| Non-vested balance at end of period (in shares) | 1,111,274 |
| Weighted Average Grant Date Fair Value | |
| Non-vested balance at beginning of period (in dollars per share) | $ / shares | $ 9.75 |
| Awarded (in dollars per share) | $ / shares | 28.15 |
| Vested (in dollars per share) | $ / shares | 10.28 |
| Forfeited (in dollars per share) | $ / shares | 9.54 |
| Non-vested balance at end of period (in dollars per share) | $ / shares | $ 16.72 |
| Shares withheld for tax purposes (in shares) | 187,633 |
| Issuance of shares net of shares withheld (in shares) | 394,253 |