Leases (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Minimum Future Rental Receipts [Abstract]
2012	$ 285,462
2013	267,912
2014	234,097
2015	196,446
2016	167,297
Thereafter	752,745
Future Minimum Payments Receivable	1,903,959
Future Rental Payments [Abstract]
2012	2,624
2013	2,426
2014	1,985
2015	1,793
2016	1,465
Thereafter	13,121
Future Minimum Payments Due	23,414
Rent expense for leasehold interests	776	955	1,039
Fixed rent per annum payment for corporate headquarters	1,299
Fixed rent per annum payment 2012	865
Fixed rent per annum payment thereafter	1,153
Incentive from lessor	845
Minimum lease payment 2012	84
Minimum lease payment 2013	83
Minimum lease payment 2014	45
Minimum lease payment 2015	36
Minimum lease payment 2016	36
Minimum lease payment after 2016	9
Rent expense for corporate headquarters	$ 1,392	$ 1,332	$ 1,299

Fixed Rent Per Annum Payment

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Fixed Rent Per Annum Payment, Current

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Fixed Rent Per Annum Payment Thereafter

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 7

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Contractually required rental payments on leases meeting the criteria for capitalization, due within one year of the balance sheet date.

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-Name Statement of Financial Accounting Standard (FAS)

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Contractually required rental payments on leases meeting the criteria for capitalization, due within the fifth year from the balance sheet date.

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Contractually required rental payments on leases meeting the criteria for capitalization, due within the fourth year from the balance sheet date.

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Contractually required rental payments on leases meeting the criteria for capitalization, due within the third year from the balance sheet date.

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Contractually required rental payments on leases meeting the criteria for capitalization, due within the second year from the balance sheet date.

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Contractually required rental payments due on leases meeting the criteria for capitalization, after the fifth year from the balance sheet date.

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- Definition

This item represents the deferred credit for an incentive or inducement received by a lessee from a lessor, in order to motivate the lessee to enter the lease agreement, which incentive or inducement is to be recognized as a reduction of rental expense over the lease term.

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-Glossary Lease Incentive

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The total of future contractually required payments on 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 one 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 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 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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Future minimum rental payments in aggregate as of the balance sheet date under operating leases.

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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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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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