Commitments and Contingencies 2 (Details) (USD $) In Thousands	Dec. 31, 2010	Dec. 31, 2009
Operating Leases Future Minimum Payments Due Abstract
Operating Leases - Future Minimum Rental Payments 2011	$ 155,601
Operating Leases - Future Minimum Rental Payments 2012	133,208
Operating Leases - Future Minimum Rental Payments 2013	112,403
Operating Leases - Future Minimum Rental Payments 2014	87,172
Operating Leases - Future Minimum Rental Payments 2015	65,421
Operating Leases - Future Minimum Rental Payments After 2015	685,942
Operating Leases - Future Minimum Rental Payments Total	1,239,747
Operating Leases Future Minimum Payments Receivable Abstract
Operating Leases - Future Minimum Rental Receipts 2011	33,813
Operating Leases - Future Minimum Rental Receipts 2012	28,723
Operating Leases - Future Minimum Rental Receipts 2013	22,100
Operating Leases - Future Minimum Rental Receipts 2014	16,170
Operating Leases - Future Minimum Rental Receipts 2015	7,237
Operating Leases - Future Minimum Rental Receipts After 2015	634
Operating Leases - Future Minimum Rental Receipts Total	108,677
Capital Leases Future Minimum Payments Due Abstract
Capital Leases - Future Minimum Rental Payments 2011	823
Capital Leases - Future Minimum Rental Payments 2012	662
Capital Leases - Future Minimum Rental Payments 2013	560
Capital Leases - Future Minimum Rental Payments 2014	568
Capital Leases - Future Minimum Rental Payments 2015	576
Capital Leases - Future Minimum Rental Payments After 2015	5,811
Capital Leases - Future Minimum Rental Payments Total	9,000
Less: Interest expense	(4,223)
Present value of minimum lease payments	4,777
Less: Current portion of obligations under capital leases	(377)	(336)
Long-term portion of obligations under capital leases	$ 4,400	$ 4,712

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 and due to be paid within one year (or one operating cycle, if longer) of the balance sheet date.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 7, 10, 13

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Article 5