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SUPPLEMENTAL CASH FLOW INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash paid / (received) during the year:
Interest expenses	$ 92,175	$ 89,657	$ 57,544
Income taxes	77,665	25,129	(79,281)
Noncash investing and financing activities:
Decrease in collateral for securities lending transactions		$ (96,653)	$ (10,630)

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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