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Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating ground leases [Abstract]
Rental property expense	$ 2,500	$ 2,500	$ 2,900
Operating ground leases, scheduled future minimum payments [Abstract]
Operating leases, future minimum payments, 2019	2,184
Operating leases, future minimum payments, 2020	2,223
Operating leases, future minimum payments, 2021	2,263
Operating leases, future minimum payments, 2022	2,305
Operating leases, future minimum payments, 2023	2,308
Operating leases, future minimum payments, thereafter	86,577
Operating leases, total future minimum payments due	97,860
Lease and Contractual Commitments [Abstract]
Lease and contractual commitments	484,800
Accrued amount of lease and contractual commitments	60,400
Contingent Consideration [Abstract]
Asset acquisition, contingent consideration liability	0	750	$ 0
Asset Acquisition Contingent Consideration [Member]
Contingent Consideration [Abstract]
Asset acquisition, contingent consideration liability	$ 5,000	$ 5,000

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Amount of liability recognized arising from contingent consideration in an asset acquisition.

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Completion Contracts [Abstract]

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Contingent Consideration [Abstract]

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The amount as of the balance sheet date of the entity’s accrued completion contract obligation under signed leases and contracts for operating properties (excluding tenant-funded tenant improvements) and contracts for development/redevelopment projects.

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The amount of the entity’s completion contract obligation under signed leases and contracts for operating properties (excluding tenant-funded tenant improvements) and contracts for development/redevelopment projects.

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Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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No definition available.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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