Operating Leases (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of annualized lease revenue	90.00%
Operating Leases, Future Minimum Payments Receivable [Abstract]
2014	$ 386,504
2015	394,329
2016	372,684
2017	352,014
2018	321,294
Thereafter	1,446,082
Total	$ 3,272,907
Customer Concentration Risk [Member] \| Federal Governmental Agencies [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	10.00%

Operating Leases, Income Statement, Percentage of Annualized Lease Revenue

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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 825

-SubTopic 10

-Section 50

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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

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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.

+ References

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