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Supplemental Disclosures of Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Supplemental Disclosures of Cash Flow Information [Abstract]
Cash paid during the year for interest	$ 26,452	$ 24,857
Cash paid during the year for income taxes	68	16,000
Increase in noncash property additions	$ 17,569	$ 4,129

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.