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Leases - Summary of Quantitative Disclosures for Lessees (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Lease cost:
Total lease cost	$ 7,636
Corporate Office Leases [Member]
Lease cost:
Operating lease cost	918
Short-term lease cost	56
Variable lease cost	261
Operating cash flows from Operating leases	1,248
ROU assets obtained in exchange for new operating lease liabilities	$ 16,687
Weighted-average remaining lease term – operating leases	6 years 6 months
Weighted-average discount rate – operating leases	3.70%
Ground Leases [Member]
Lease cost:
Operating lease cost	$ 5,550
Variable lease cost	851
Operating cash flows from Operating leases	4,493
ROU assets obtained in exchange for new operating lease liabilities	$ 422,018
Weighted-average remaining lease term – operating leases	56 years 9 months 18 days
Weighted-average discount rate – operating leases	5.00%

X

- Definition

Amount of lease cost recognized by lessee for lease contract.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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