RESTATEMENT OF CONSOLIDATED FINANCIAL STATEMENTS (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2011	Dec. 31, 2010
RESTATEMENT OF CONSOLIDATED FINANCIAL STATEMENTS
Deferred income tax liability relating to a gain recorded in 2002	$ 380,865	$ 380,865
Consolidated Balance Sheet
Other non-current assets	79,863	81,908
Total Assets	3,429,862	3,329,079
Deferred income taxes	301,567	270,501
Other long-term liabilities	19,569	20,239
Additional paid-in capital	11,159,083	11,047,884
Total shareholders' equity	2,090,770	2,050,068
Total Liabilities and Shareholders' Equity	3,429,862	3,329,079
As originally reported
Consolidated Balance Sheet
Other non-current assets	159,302	192,383
Total Assets	3,509,301	3,439,554
Other long-term liabilities	19,710	20,350
Additional paid-in capital	11,539,948	11,428,749
Total shareholders' equity	2,471,635	2,430,933
Total Liabilities and Shareholders' Equity	3,509,301	3,439,554
Revision of calculation of deferred income tax liability | Effect of restatement
Consolidated Balance Sheet
Other non-current assets	(79,439)	(110,475)
Total Assets	(79,439)	(110,475)
Deferred income taxes	301,567	270,501
Other long-term liabilities	(141)	(111)
Additional paid-in capital	(380,865)	(380,865)
Total shareholders' equity	(380,865)	(380,865)
Total Liabilities and Shareholders' Equity	$ (79,439)	$ (110,475)