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EQUITY-BASED COMPENSATION - Restricted stock (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
EQUITY-BASED COMPENSATION
Payments for repurchase of common stock	$ 10,876	$ 18,600	$ 16,562
Restricted Stock
EQUITY-BASED COMPENSATION
Compensation expense	7,200	8,500	$ 4,300
Unrecognized compensation expense	7,200
Payments for repurchase of common stock	$ 1,500	$ 1,000
Weighted-average remaining life	1 year 8 months 12 days
Restricted Stock | Minimum
EQUITY-BASED COMPENSATION
offering period	1 year
Restricted Stock | Maximum
EQUITY-BASED COMPENSATION
offering period	3 years
Restricted Stock Awards
Restricted stock
Beginning balance (in shares)	1,518,193
Granted (in shares)	1,477,488
Vested (in shares)	(578,281)
Forfeited (in shares)	(374,299)
Repurchased (in shares)	(40,029)
Ending balance (in shares)	2,003,072	1,518,193
Grant Date Fair Value
Beginning balance (in dollars per share)	$ 10.08
Granted (in dollars per share)	5.80
Vested (in dollars per share)	11.79
Forfeited (in dollars per share)	7.43
Repurchased (in dollars per share)	7.81
Ending balance (in dollars per share)	$ 6.97	$ 10.08
Restricted Stock Units
Restricted stock
Beginning balance (in shares)	1,250
Granted (in shares)	0
Vested (in shares)	(625)
Forfeited (in shares)	(625)
Ending balance (in shares)		1,250
Grant Date Fair Value
Beginning balance (in dollars per share)	$ 19.00
Vested (in dollars per share)	20.00
Forfeited (in dollars per share)	$ 18.00
Ending balance (in dollars per share)		$ 19.00

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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The cash outflow to reacquire common stock during the period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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