Lease Obligations - Future Sublease Payments for Ground Lease Rentals (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
2019 remaining	$ 176,038
2020	327,898
2021	277,198
2022	221,595
2023	173,512
2024	124,128
Thereafter	405,975
Total	1,706,344
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Finance lease		$ 14,382
2019		22,528
2020		20,903
2021		18,886
2022		17,245
2023		15,128
Thereafter		43,439
Total		$ 138,129
Lessee, Finance Leases, Sublease Rentals [Member]
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
Finance lease	14,003
Lessee, Operating Leases, Sublease Rentals [Member]
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
2019 remaining	11,744
2020	22,387
2021	20,277
2022	18,513
2023	16,370
2024	11,232
Thereafter	34,634
Total	$ 135,157

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Minimum payments receivable in the future under noncancelable subleases.

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Amount of lease payments to be received by lessor for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-SubTopic 30
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Amount of lease payments to be received by lessor in fifth fiscal year following latest fiscal year for operating lease. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest statement of financial position date.

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Amount of lease payments to be received by lessor in fourth year following latest fiscal year for operating lease. Excludes interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

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Amount of lease payments to be received by lessor in remainder of fiscal year following latest fiscal year for operating lease. Excludes interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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Amount of lease payments to be received by lessor after fifth fiscal year following latest statement of financial position date for operating lease. Excludes interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

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Amount of lease payments to be received by lessor in third fiscal year following latest fiscal year for operating lease. Excludes interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

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Amount of lease payments to be received by lessor in second fiscal year following latest fiscal year for operating lease. Excludes interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

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Contractually required future rental payments receivable on noncancelable subleasing arrangements.

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Lessor, Finance Lease, Payments to be Received

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Contractually required future rental payments receivable on noncancelable subleasing arrangements due in five years.

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Contractually required future rental payments receivable on noncancelable subleasing arrangements due in four years.

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Contractually required future rental payments receivable on noncancelable subleasing arrangements due in three years.

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Contractually required future rental payments receivable on noncancelable subleasing arrangements due in two years.

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Contractually required future rental payments receivable on noncancelable subleasing arrangements due in next 12 months.

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Contractually required future rental payments receivable on noncancelable subleasing arrangements due thereafter.

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