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BORROWINGS (Details 5) (USD $)	3 Months Ended		0 Months Ended
BORROWINGS (Details 5) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Mar. 20, 2013 7 500% Senior notes due March 20, 2042	Mar. 20, 2012 7 500% Senior notes due March 20, 2042
Details of Company's borrowings
Aggregate principal amount of the notes			$ 115,000,000
Interest rate (as a percent)				7.50%
Total net proceeds from senior notes	$ 0	$ 111,418,000	$ 111,400,000

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

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