Commitments And Contingencies (Minimum Aggregate Lease Payments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Commitments And Contingencies [Abstract]
Gross Rents, 2012	$ 18,318
Gross Rents, 2013	18,857
Gross Rents, 2014	18,708
Gross Rents, 2015	18,566
Gross Rents, 2016	18,271
Gross Rents, Thereafter	258,052
Gross Rents, Total lease commitments	350,772
Sublease Rents, 2012	1,350
Sublease Rents, 2013	1,327
Sublease Rents, 2014	1,160
Sublease Rents, 2015	1,085
Sublease Rents, 2016	994
Sublease Rents, Thereafter	4,682
Sublease Rents, Total lease commitments	10,598
Net Rents, 2012	16,968
Net Rents, 2013	17,530
Net Rents, 2014	17,548
Net Rents, 2015	17,481
Net Rents, 2016	17,277
Net Rents, Thereafter	253,370
Net Rents, Total lease commitments	$ 340,174

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This element represents the total aggregate minimum sublease rentals, if any, to be received under noncancelable subleases existing as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 98

-Paragraph 18

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

This element represents the total of minimum sublease rentals, if any, to be received under noncancelable subleases after the fifth year following the balance sheet date.

+ References

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- Definition

This element represents the total of minimum sublease rentals, if any, to be received under noncancelable subleases within the fifth year following the balance sheet date.

+ References

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This element represents the total of minimum sublease rentals, if any, to be received under noncancelable subleases within the fourth year following the balance sheet date.

+ References

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This element represents the total of minimum sublease rentals, if any, to be received under noncancelable subleases within the third year following the balance sheet date.

+ References

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- Definition

This element represents the total of minimum sublease rentals, if any, to be received under noncancelable subleases within the second year following the balance sheet date.

+ References

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- Definition

The total of future contractually required payments on leases defined as operating.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 122

-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.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 16

-Subparagraph b(i)

-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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

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-Publisher FASB

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- Definition

For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the fifth year of the balance sheet date relating to leases defined as operating.

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the fourth year of the balance sheet date relating to leases defined as operating.

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the third year of the balance sheet date relating to leases defined as operating.

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the second year of the balance sheet date relating to leases defined as operating.

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due after the fifth year from the balance sheet date on leases defined as operating.

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- Definition

Future Minimum Sublease Rentals Sale Leaseback Transactions Within Six Years

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No definition available.

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- Definition

Operating Leases Future Minimum Payments Due In Six Years

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No definition available.

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- Definition

Operating leases future minimum payments, gross rent due

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No definition available.

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Operating leases future minimum payments, gross rent due, in five years

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No definition available.

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- Definition

Operating leases future minimum payments, gross rent due, in four years

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Operating Leases Future Minimum Payments Gross Rent Due In Six Years

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- Definition

Operating leases future minimum payments, gross rent due, in three years

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No definition available.

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Operating leases future minimum payments, gross rent due, in two years

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Operating leases future minimum payments, gross rent due, thereafter

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