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Supplemental Disclosures of Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Supplemental Disclosures of Cash Flow Information [Abstract]
Cash paid for interest	$ 44,343	$ 26,452
Cash paid for income taxes	16,341	68
Noncash property changes	$ 35,857	$ 17,569

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.