Investment in Office and Parking Properties - Contractual Obligations and Minimum Rental Receipts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Obligations for tenant improvement allowances and lease inducement costs for lease in place and commitments for buildings [Abstract]
2015	15,362
2016	69
2017	0
2018	232
2019	0
Total	15,663us-gaap_ContractualObligation
Minimum future operating lease payments
2015	158
2016	77
2017	22
2018	0
2019	0
Total	257
Future approximate minimum rental receipts under noncancelable leases [Abstract]
2015	294,962
2016	293,192
2017	258,665
2018	230,263
2019	201,456
Thereafter	866,367
Total	2,144,905
Ground Leases, Future Minimum Payments Due [Abstract]
2015	294,962
2016	293,192
2017	258,665
2018	230,263
2019	201,456
Thereafter	866,367
Total	2,144,905
Corporate Center I, II, and III
Ground Leases, Future Minimum Payments Due [Abstract]
Ground lease remaining term	66 years
Ground lease payment adjustment percentage	5.00%
Ground lease payment adjustment term	10 years
Westshore Corporate Center
Ground Leases, Future Minimum Payments Due [Abstract]
Remaining lease term	20 years
NASCAR Plaza
Ground Leases, Future Minimum Payments Due [Abstract]
Remaining lease term	91 years
Corporate Center IV
Ground Leases, Future Minimum Payments Due [Abstract]
Ground lease remaining term	66 years
Corporate Center V
Ground Leases, Future Minimum Payments Due [Abstract]
Ground lease remaining term	66 years
Lincoln Place
Ground Leases, Future Minimum Payments Due [Abstract]
Remaining lease term	35 years
Land
Future approximate minimum rental receipts under noncancelable leases [Abstract]
2015	1,370
2016	1,308
2017	1,338
2018	1,339
2019	1,339
Thereafter	93,392
Total	100,086
Ground Leases, Future Minimum Payments Due [Abstract]
2015	1,370
2016	1,308
2017	1,338
2018	1,339
2019	1,339
Thereafter	93,392
Total	100,086

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Lessor Leasing Arrangements, Operating Leases, Payment Adjustment Percentage

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Lessor Leasing Arrangements, Operating Leases, Payment Adjustment Term

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- Definition

Obligations for tenant improvement allowances and lease inducement costs for leases in place and commitments for building improvements due in five years.

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No definition available.

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Obligations for tenant improvement allowances and lease inducement costs for leases in place and commitments for building improvements due in four years.

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Obligations For Tenant Improvement Allowances And Lease Inducement Costs Due in the Next Twelve Months

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Obligations for tenant improvement allowances and lease inducement costs for leases in place and commitments for building improvements due in three years.

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Obligations for tenant improvement allowances and lease inducement costs for leases in place and commitments for building improvements due in two years.

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Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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Term of the lessor's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Period remaining on leases or concessions that will expire on undeveloped acreage, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Industry Guide

-Number 2

-Paragraph 5

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

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-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

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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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- Definition

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

+ References

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)

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

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

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

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

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