Equity-based Compensation - Time-Based Restricted Stock Units and Deferred Stock Units (Details) - Equity Plan [Member]	9 Months Ended
	Sep. 30, 2017 $ / shares shares
Time-Based Restricted Stock Units [Member]
Number of Shares/Units
Unvested shares, Beginning Balance (shares) | shares	1,085,914
Granted (shares) | shares	673,381
Vested (shares) | shares	(412,692)
Forfeited (shares) | shares	(16,936)
Unvested shares, Ending Balance (shares) | shares	1,329,667
Weighted-Average Grant Date Fair Value
Unvested shares, Beginning Balance (in dollars per share) | $ / shares	$ 8.43
Granted (in dollars per share) | $ / shares	8.90
Vested (in dollars per share) | $ / shares	8.62
Forfeited (in dollars per share) | $ / shares	8.54
Unvested shares, Ending Balance (in dollars per share) | $ / shares	$ 8.61
Deferred Stock Units [Member]
Number of Shares/Units
Unvested shares, Beginning Balance (shares) | shares	0
Granted (shares) | shares	117,003
Vested (shares) | shares	(117,003)
Forfeited (shares) | shares	0
Unvested shares, Ending Balance (shares) | shares	0
Weighted-Average Grant Date Fair Value
Unvested shares, Beginning Balance (in dollars per share) | $ / shares	$ 0.00
Granted (in dollars per share) | $ / shares	7.91
Vested (in dollars per share) | $ / shares	7.91
Forfeited (in dollars per share) | $ / shares	0.00
Unvested shares, Ending Balance (in dollars per share) | $ / shares	$ 0.00