The excess tax benefit from share based compensation expense.

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Amount, after tax, of expense for award under share-based payment arrangement.

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Amount of cost capitalized for award under share-based payment arrangement.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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Net number of non-option equity instruments granted to participants.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Equity-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Employee stock-based compensation expense
Equity-based compensation capitalized	$ (32)	$ (229)	$ (139)
Equity-based compensation expense	16,267	10,934	9,176
Tax deficit / (benefit) from equity-based compensation	(2,308)	(1,548)	(1,297)
Deficit / (excess) tax benefit from equity-based compensation	378	55	(145)
Net compensation cost	$ 14,337	9,441	7,734
Restricted Stock Units
Vesting Period	3 years
Time-based awards
Employee stock-based compensation expense
Equity-based compensation expense	$ 12,224	$ 7,554	$ 5,189
Restricted Stock Units
Nonvested at beginning of period	455,452
Granted	769,750
Shares vested (including tax withholding)	(189,354)
Forfeited	(17,840)
Nonvested at end of period	1,018,008	455,452
Nonvested at beginning of period, Weighted average grant date fair value per share	$ 46.15
Granted, Weighted average grant date fair value per share	33.05	$ 38.43	$ 53.04
Shares vested (including tax withholding) , Weighted average grant date fair value per share	44.41
Forfeited, Weighted average grant date fair value per share	35.94
Nonvested at end of period, Weighted average grant date fair value per share	$ 36.74	$ 46.15
Unrecognized compensation cost	$ 25,100
Period for recognition of RSU compensation expense	2 years
Time-based awards \| Minimum
Restricted Stock Units
Vesting Period	2 years
Time-based awards \| Maximum
Restricted Stock Units
Vesting Period	4 years
Time-based awards \| Directors
Restricted Stock Units
Vesting Period	1 year
Time-based awards \| Employees
Restricted Stock Units
Vesting Period	3 years
Performance-based awards
Employee stock-based compensation expense
Equity-based compensation expense	$ 2,150	$ (179)	$ 4,126
Restricted Stock Units
Nonvested at beginning of period	139,964
Granted	205,188
Shares vested (including tax withholding)	(6,331)
Forfeited	(57,086)
Nonvested at end of period	281,735	139,964
Nonvested at beginning of period, Weighted average grant date fair value per share	$ 45.31
Granted, Weighted average grant date fair value per share	29.90	$ 38.87	$ 55.38
Shares vested (including tax withholding) , Weighted average grant date fair value per share	38.49
Forfeited, Weighted average grant date fair value per share	49.08
Nonvested at end of period, Weighted average grant date fair value per share	$ 23.37	$ 45.31
Vesting Period		3 years
Period of performance measurement	3 years
Unrecognized compensation cost	$ 5,100
Period for recognition of RSU compensation expense	1 year 10 months 24 days
Number of shares that will vest if minimum threshold conditions are not met	0
Performance-based awards \| Minimum
Restricted Stock Units
Shares issued upon participants target award	0.00%
Performance-based awards \| Maximum
Restricted Stock Units
Shares issued upon participants target award	150.00%
Other performance awards
Employee stock-based compensation expense
Equity-based compensation expense		$ (500)
Bonus settled in shares
Employee stock-based compensation expense
Equity-based compensation expense	$ 1,925	3,788
Restricted stock
Restricted Stock Units
Additional shares available to grant under plan (in shares)	1,407,058
Booj Llc \| Performance-based awards
Employee stock-based compensation expense
Equity-based compensation expense		$ 300