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Statements of Cash Flow (Details) (USD $)	3 Months Ended
Statements of Cash Flow (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Supplemental Cash Flow Information [Abstract]
Interest payments	$ 53,691,000	$ 45,358,000
Income taxes paid	$ 23,850,000	$ 3,249,000

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.

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