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ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Net Unrealized Gain (Loss) on Cash Flow Hedges        
Balance at the beginning of the period     $ (25,245)  
Unrealized gain on cash flow hedges, net 1,525 2,417 6,394 10,333
Balance at the end of the period (18,851)   (18,851)  
Unrealized Gain on Investments        
Balance at the beginning of the period     7,696  
Change in unrealized gain on investments (3,561) (14,602) (643) (26,866)
Balance at the end of the period 7,053   7,053  
AOCI        
Balance at the beginning of the period     (17,549)  
Change in unrealized gain on investments (3,561) (14,602) (643) (26,866)
Unrealized gain on cash flow hedges, net 1,525 2,417 6,394 10,333
Balance at the end of the period $ (11,798)   $ (11,798)