Share-Based Compensation Arrangement By Share-Based Payment Award, Holding Period

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Maximum Share Value Authorized Under Plan

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Total Stock Return, Absolute Hurdle Rate

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Total Stock Return, Annual Absolute Hurdle Rate

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Total Stock Return, Maximum Reduction Percentage

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- Definition

Share-based Compensation Arrangement By Share-based Payment Award, Fair Value Assumptions, Stock Price Assuming Maximum Bonus Pool Eligibility

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- Definition

Share-based Compensation Arrangement By Share-based Payment Award, Mandatory Holding Period Upon Vesting

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Vesting Percentage After Initial Performance Period

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- Definition

Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation.

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-Name Accounting Standards Codification
-Topic 718
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- Definition

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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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

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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- Definition

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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- Definition

The number of grants made 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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- Definition

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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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- Definition

Percentage of vesting of share-based compensation awards.

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Stock-Based Compensation - Additional Information (Details) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Feb. 28, 2018	Feb. 28, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock price assumption for maximum bonus pool eligibility (in dollars per share)		$ 29.06
Performance period (in years)		3 years
Vesting percentage after performance period		50.00%
Mandatory holding period upon vesting		4 years
Amortization of stock-based compensation		$ 18,125,000	$ 15,915,000	$ 14,654,000
Unrecognized compensation cost related to unvested share-based payments		$ 32,200,000
Unrecognized compensation cost, amortization period (in years)		3 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		2 years
Granted (in shares)		190,557	918,884	489,826
Granted (in dollars per share)		$ 29.53	$ 34.37	$ 30.95
Time-based restricted operating partnership performance units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		318,549
Granted (in dollars per share)		$ 28.41
2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance		2,500,000
Existing and Newly Elected Board Member
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		3 years
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		3 years
One-Time Retention Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Retention awards, vesting percentage	25.00%	50.00%
Outperformance Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum bonus pool		$ 25,000,000.0	$ 20,000,000.0			$ 25,000,000.0
Absolute TSR hurdle rate					21.00%
Annual absolute TSR hurdle rate					7.00%
TSR maximum reduction percentage					75.00%
Outperformance Program \| Expensed stock compensation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		17,028,000	15,079,000	$ 14,144,000
Outperformance Program \| Capitalized stock compensation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		$ 1,097,000	$ 836,000	$ 510,000