Operating Leases (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of metropolitan areas	17
Operating Leases, Future Minimum Payments Receivable [Abstract]
2013	377,746
2014	349,565
2015	346,084
2016	310,798
2017	290,158
Thereafter	1,384,133
Total	3,058,484
Geographic Concentration Risk [Member] \| Chicago [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	23.10%
Geographic Concentration Risk [Member] \| DISTRICT OF COLUMBIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	22.00%
Geographic Concentration Risk [Member] \| NEW YORK
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	14.60%
Customer Concentration Risk [Member] \| Federal Governmental Agencies [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	13.30%

Number of Metropolitan Areas In Which Entity Operates

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611

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-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592

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-Name Accounting Standards Codification

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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)

-URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 23

-Subparagraph b(ii)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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.

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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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