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ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net Unrealized Gain (Loss) on Cash Flow Hedges      
Balance at the beginning of the period $ (25,245) $ (43,152) $ (41,819)
Unrealized loss on cash flow hedges 9,188 17,907 (1,333)
Balance at the end of the period (16,057) (25,245) (43,152)
Unrealized Gain (Loss) on Investments      
Balance at the beginning of the period 7,696 37,942 55,408
Change in unrealized gain on investments (3,480) (30,246) (17,466)
Balance at the end of the period 4,216 7,696 37,942
AOCI      
Balance at the beginning of the period (17,549) (5,210) 13,589
Change in unrealized gain on investments (3,480) (30,246) (17,466)
Unrealized loss on cash flow hedges 9,188 17,907 (1,333)
Balance at the end of the period $ (11,841) $ (17,549) $ (5,210)