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Supplemental Disclosures of Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Supplemental Disclosures of Cash Flow Information [Abstract]
Cash paid during the year for interest	$ 3,368	$ 6,991	$ 29,820	$ 31,848
Cash paid during the year for income taxes		1,000	68	17,000
Noncash property additions	$ 3,220	$ 58,741	$ 20,789	$ 62,870

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.