Payout per unit average 30 days closing price.

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Payout range maximum.

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Types of performance-based 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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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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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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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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Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders.

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Number of share options (or share units) exercised during the current period.

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Stock-Based Compensation (Details) $ in Thousands	3 Months Ended		6 Months Ended
Stock-Based Compensation (Details) $ in Thousands	Jun. 30, 2018 USD ($) award shares	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) award shares	Jun. 30, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $	$ 3,400	$ 2,900	$ 6,000	$ 4,600
Number of stock options exercised (in shares)	457,206
Value of stock issued during period resulting from exercise of stock options \| $	$ 945
Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $	$ 1,100
Number of shares issued in lieu of fees	118,555
Restricted Stock \| Key Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted			315,199
Vesting period			3 years
Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Types of performance-based RSUs \| award	2		2
Ultimate payout, minimum (as a percent)			0.00%
Ultimate payout, maximum (as a percent)			200.00%
Number of trading days used to determine average closing price			30 days
TSR RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted			315,124
FFO RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted			135,054
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock issued during period (in shares)	47,309