Equity-Based Compensation - Stock Options (Details) - Stock options - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock options
Outstanding at the beginning of the period (in shares)	720,887
Options forfeited (in shares)	(32,958)
Outstanding at the end of the period (in shares)	687,929	720,887
Vested or expected to vest (in shares)	687,929
Exercisable (in shares)	217,882
Weighted average exercise price
Outstanding at the beginning of the period (in dollars per share)	$ 50.44
Options forfeited (in dollars per share)	50.00
Outstanding at the end of the period (in dollars per share)	50.46	$ 50.44
Vested or expected to vest (in dollars per share)	50.46
Exercisable (in dollars per share)	$ 51.17
Weighted average remaining contractual life
Outstanding	8 years 1 month 13 days	9 years 1 month 21 days
Vested or expected to vest	8 years 1 month 13 days
Exercisable	7 years 10 months 13 days
Weighted-average assumptions used to calculate fair value of stock options granted
Dividend yield (as a percent)	0.00%
Volatility (as a percent)		40.00%	40.00%
Risk-free interest rate (as a percent)		1.66%	1.75%
Expected life		6 years 3 months	5 years 6 months
Weighted average fair value of options granted (in dollars per share)		$ 14.74	$ 20.55
Additional disclosures
Unrecognized stock-based compensation expense	$ 5.4
Weighted average period for recognizing unrecognized stock-based compensation expense	2 years 2 months 12 days
Minimum
Stock-based compensation
Vesting period	1 year
Maximum
Stock-based compensation
Vesting period	4 years
Contractual life	10 years