The excess tax benefit from share based compensation expense.

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The number of installments in a vesting period.

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Percentage of the number of shares that could be issued out of the participants target award.

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The period over which the Company's performance is measured for the purpose of awarding of performance-based Restricted Stock Units (RSUs).

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Represents the number of shares that will vest if the minimum threshold conditions are not met.

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

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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) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) installment $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares
Employee stock-based compensation expense
Equity-based compensation capitalized (a) \| $	$ (229)	$ (139)
Equity-based compensation expense \| $	10,934	9,176	$ 2,900
Tax benefit from equity-based compensation \| $	(1,548)	(1,297)	(637)
Deficit / (excess) tax benefit from equity-based compensation \| $	55	(145)	(324)
Net compensation cost \| $	$ 9,441	7,734	1,939
Restricted Stock Units
Vesting Period	3 years
Time-based awards
Employee stock-based compensation expense
Equity-based compensation expense \| $	$ 7,554	$ 5,189	$ 2,523
Restricted Stock Units
Nonvested at beginning of period \| shares	298,610
Granted \| shares	257,087
Shares vested \| shares	(80,008)
Forfeited \| shares	(20,237)
Nonvested at end of period \| shares	455,452	298,610
Nonvested at beginning of period, Weighted average grant date fair value per share \| $ / shares	$ 51.97
Granted, Weighted average grant date fair value per share \| $ / shares	38.43	$ 53.04	$ 55.45
Shares vested, Weighted average grant date fair value per share \| $ / shares	43.30
Forfeited, Weighted average grant date fair value per share \| $ / shares	45.41
Nonvested at end of period, Weighted average grant date fair value per share \| $ / shares	$ 46.15	$ 51.97
Unrecognized compensation cost \| $	$ 12,600
Period for recognition of RSU compensation expense	2 years 1 month 6 days
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 \| $	$ (179)	$ 4,126	$ 377
Restricted Stock Units
Nonvested at beginning of period \| shares	179,615
Granted \| shares	119,410
Shares vested \| shares	(97,436)
Forfeited \| shares	(61,625)
Nonvested at end of period \| shares	139,964	179,615
Nonvested at beginning of period, Weighted average grant date fair value per share \| $ / shares	$ 55.75
Granted, Weighted average grant date fair value per share \| $ / shares	38.87	$ 55.38	$ 57.88
Shares vested, Weighted average grant date fair value per share \| $ / shares	36.20
Forfeited, Weighted average grant date fair value per share \| $ / shares	56.24
Nonvested at end of period, Weighted average grant date fair value per share \| $ / shares	$ 45.31	$ 55.75
Vesting Period	3 years
Period of performance measurement	3 years
Unrecognized compensation cost \| $	$ 2,300
Period for recognition of RSU compensation expense	1 year 9 months 18 days
Number of shares that will vest if minimum threshold conditions are not met \| shares	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 \| $	$ 3,788
Restricted Stock Units (RSUs)
Restricted Stock Units
Additional shares available to grant under plan (in shares) \| shares	2,122,970
Booj Llc \| Time-based awards
Restricted Stock Units
Vesting Period	4 years
Number of installments in a vesting period \| installment	3
Booj Llc \| Performance-based awards
Employee stock-based compensation expense
Equity-based compensation expense \| $	$ 300
Booj Llc \| Performance-based awards \| Minimum
Restricted Stock Units
Shares issued upon participants target award	0.00%
Booj Llc \| Performance-based awards \| Maximum
Restricted Stock Units
Shares issued upon participants target award	100.00%