Supplemental Cash Flow Information (Details) (USD $)	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Supplemental Cash Flow Information [Abstract]
Interest paid	$ 201,541,000	$ 208,350,000
Income taxes paid	3,543,000	2,218,000
Increase (decrease) in the fair value of forward-starting interest rate swaps	0	(100,242,000)
Assets acquired through capital leases and installment sales	$ 13,025,000	$ 5,322,000

Increase (decrease) in the fair value of forward-starting interest rate swaps.

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- Definition

The increase during the period in capital lease obligations due to entering into new capital leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 32

+ Details

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- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 29

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 27
-Subparagraph f

+ Details

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- Definition

The amount of cash paid during the current period for interest owed on money borrowed; includes amount of interest capitalized

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 29

+ Details

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- Details

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