Equity-Based Compensation - Stock Options Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of Shares
Outstanding at December 31, 2018 (in shares)	901,996
Granted (in shares)	0	0	0
Exercised (in shares)	(10,000)	(4,167)	(43,774)
Forfeited (in shares)	0
Expired (in shares)	(65,338)
Outstanding at December 31, 2019 (in shares)	826,658	901,996
Exercisable at December 31, 2019 (in shares)	826,658
Weighted Average Exercise Price
Outstanding at December 31, 2018, (in dollars per share)	$ 28.52
Granted (in dollars per share)	0
Exercised (in dollars per share)	12.87
Forfeited (in dollars per share)	0
Expired (in dollars per share)	25.16
Outstanding at December 31, 2019, (in dollars per share)	28.97	$ 28.52
Exercisable at December 31, 2019 (in dollars per share)	$ 28.97
Aggregate Intrinsic Value (in thousands)
Outstanding, aggregate intrinsic value	$ 0	$ 18,566
Exercisable, aggregate intrinsic value	$ 11,557
Weighted Average Remaining Contractual Term in Years
Outstanding, weighted average remaining contractual term in years	4 years 1 month 6 days	4 years 9 months 18 days
Exercisable, weighted average remaining contractual term in years	4 years 1 month 6 days