Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands |
Sep. 30, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Accumulated amortization of debt financing costs | $ 11,360 | $ 9,350 |
| Class A common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |
| Class A common stock, shares authorized | 500,000,000 | 500,000,000 |
| Class A common stock, shares outstanding | 88,569,377 | 87,410,687 |
| Treasury stock, shares | 115,146 | 110,964 |