EARNINGS PER SHARE (NVE) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Numerator
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 223,170		$ 173,462		$ 304,782		$ 188,680
Denominator
Weighted Average Shares of Common Stock Outstanding - basic	235,961,402		235,990,373		235,986,874		235,796,321
Per Share Amounts
Net income per share - basic	$ 0.95		$ 0.74		$ 1.29		$ 0.80
Numerator
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 223,170		$ 173,462		$ 304,782		$ 188,680
Denominator
Weighted Average Number of Shares Outstanding, Basic	235,961,402		235,990,373		235,986,874		235,796,321
Stock options (in shares)	39,256		33,343		37,592		36,314
Non-Employee Director stock plan (in shares)	166,829		141,122		160,257		142,587
Employee stock purchase plan (in shares)	6,742		4,012		6,785		4,547
Restricted Shares (in shares)	584,750		146,464		533,750		123,940
Performance Shares (in shares)	1,362,753		1,586,016		1,125,272		1,217,087
Weighted Average Number of Shares Outstanding, Diluted	238,121,732	[1]	237,901,330	[1]	237,850,530	[1]	237,320,796	[1]
Per Share Amounts
Net income per share - diluted	$ 0.94		$ 0.73		$ 1.28		$ 0.80
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	327,503		329,382		409,080		409,080

[1] The denominator does not include stock equivalents for options issued under the non-qualified stock option plan due to conversion prices higher than market prices for all periods. If the conditions for conversion were met under this plan, 327,503 and 329,382 shares would be included for the three and nine months ended September 30, 2012, respectively, and 409,080 would be included for both the three and nine months ended September 30, 2011.