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Supplemental Disclosures of Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Supplemental Disclosures of Cash Flow Information [Abstract]
Cash paid during the year for interest	$ 45,667	$ 25,897	$ 75,487	$ 57,745
Cash paid during the year for income taxes	400	3,391	468	20,391
Noncash property changes	$ (55,729)	$ (46,792)	$ (34,940)	$ 16,078

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.