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 expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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No definition available.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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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No definition available.

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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	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) installment $ / shares shares	Sep. 30, 2017 USD ($)
Employee stock-based compensation expense
Equity-based compensation expense \| $	$ 2,717	$ 868	$ 6,141	$ 2,161
2013 Stock Incentive Plan
Employee stock-based compensation expense
Equity-based compensation expense \| $	2,717	868	6,141	2,161
Tax benefit from share-based compensation \| $	(384)	(191)	(868)	(475)
Excess tax benefit from share-based compensation \| $			(145)	(324)
Net compensation cost \| $	$ 2,333	677	$ 5,128	1,362
Restricted Stock Units
Additional shares available to grant under plan (in shares)	2,241,423		2,241,423
Time-based Restricted Stock Units
Restricted Stock Units
Nonvested at beginning of period			105,862
Granted			253,315
Shares vested (including tax withholding)			(64,878)
Forfeited			(4,477)
Nonvested at end of period	289,822		289,822
Nonvested at beginning of period, Weighted average grant date fair value per share \| $ / shares			$ 41.67
Granted, Weighted average grant date fair value per share \| $ / shares			54.06
Shares vested (including tax withholding), Weighted average grant date fair value per share \| $ / shares			40.96
Forfeited, Weighted average grant date fair value per share \| $ / shares			42.38
Nonvested at end of period, Weighted average grant date fair value per share \| $ / shares	$ 52.65		$ 52.65
Unrecognized compensation cost \| $	$ 12,400		$ 12,400
Period for recognition of RSU compensation expense			2 years 10 months 10 days
Time-based Restricted Stock Units \| 2013 Stock Incentive Plan
Employee stock-based compensation expense
Equity-based compensation expense \| $	$ 1,412	750	$ 3,270	1,892
Time-based Restricted Stock Units \| Directors
Restricted Stock Units
Vesting Period			1 year
Time-based Restricted Stock Units \| Employees
Restricted Stock Units
Vesting Period			3 years
Performance-based Restricted Stock Units
Restricted Stock Units
Nonvested at beginning of period			31,831
Granted			156,694
Forfeited			(3,213)
Nonvested at end of period	185,312		185,312
Nonvested at beginning of period, Weighted average grant date fair value per share \| $ / shares			$ 57.88
Granted, Weighted average grant date fair value per share \| $ / shares			55.38
Forfeited, Weighted average grant date fair value per share \| $ / shares			57.55
Nonvested at end of period, Weighted average grant date fair value per share \| $ / shares	$ 55.77		$ 55.77
Unrecognized compensation cost \| $	$ 6,100		$ 6,100
Period for recognition of RSU compensation expense			1 year 5 months 19 days
Performance-based Restricted Stock Units \| Minimum
Restricted Stock Units
Shares issued upon participants target award			0.00%
Performance-based Restricted Stock Units \| Maximum
Restricted Stock Units
Shares issued upon participants target award			150.00%
Performance-based Restricted Stock Units \| 2013 Stock Incentive Plan
Employee stock-based compensation expense
Equity-based compensation expense \| $	$ 1,305	$ 118	$ 2,871	$ 269
Restricted Stock Units (RSUs)
Restricted Stock Units
Period of performance measurement			3 years
Booj Llc \| Time-based Restricted Stock Units
Restricted Stock Units
Vesting Period			4 years
Number of installments in a vesting period \| installment			3
Booj Llc \| Performance-based Restricted Stock Units \| Minimum
Restricted Stock Units
Shares issued upon participants target award			0.00%
Booj Llc \| Performance-based Restricted Stock Units \| Maximum
Restricted Stock Units
Shares issued upon participants target award			100.00%