Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Accumulated amortization of debt financing costs	$ 9,964	$ 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	87,637,816	87,410,687
Treasury stock, shares	115,146	110,964