Future Minimum Base Rents and Lease Payments Future Minimum Rents - Future Minimum Base Rents (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Operating Leases, Future Minimum Payments Receivable [Abstract]
2018	$ 480,779
2019	456,807
2020	396,593
2021	348,360
2022	292,434
Thereafter	929,832
Total	2,904,805
Non-Cancelable Leases
Operating Leases, Future Minimum Payments Receivable [Abstract]
2018	476,777
2019	445,032
2020	376,361
2021	315,588
2022	246,997
Thereafter	805,449
Total	2,666,204
Subject to Early Termination Options
Operating Leases, Future Minimum Payments Receivable [Abstract]
2018	4,002
2019	11,775
2020	20,232
2021	32,772
2022	45,437
Thereafter	124,383
Total	$ 238,601

Future minimum rental payments in aggregate as of the balance sheet date under operating leases.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84164653&loc=d3e41551-112718

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- Definition

Future rental payments receivable within one year of the balance sheet date under an operating lease.

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- Definition

Future rental payments receivable within the fifth year from the balance sheet date under an operating lease.

+ References

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- Definition

Future rental payments receivable within the fourth year from the balance sheet date under an operating lease.

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Future rental payments receivable within the third year from the balance sheet date under an operating lease.

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- Definition

Future rental payments receivable within the second year from the balance sheet date under an operating lease.

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- Definition

Future minimum lease payments receivable under operating leases for periods greater than five years following the balance sheet date.

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