EQUITY (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Changes in equity
Balance at the beginning of the period			$ 1,193,242	$ 1,149,478
Other comprehensive income, net of tax:
Net income (loss)	66,365	57,022	130,514	103,964
Other comprehensive income (loss)	(26,225)	17,810	3,686	41,679
Comprehensive income	40,140	74,832	134,200	145,643
Cash dividends declared - $0.34 per share for 6/30/12 and $0.31 per share for 6/30/11			(28,429)	(26,126)
Cash dividends declared per share (in dollars per share)	$ 0.17	$ 0.155	$ 0.34	$ 0.31
Issuance of shares under benefit plans			22,133	12,373
Purchase of shares for treasury			(40,138)	(13,309)
Balance at the end of the period	1,281,008	1,268,059	1,281,008	1,268,059
Shareholders' Equity
Changes in equity
Balance at the beginning of the period			1,176,946	1,133,497
Other comprehensive income, net of tax:
Net income (loss)			130,562	103,923
Other comprehensive income (loss)			4,206	40,937
Comprehensive income			134,768	144,860
Cash dividends declared - $0.34 per share for 6/30/12 and $0.31 per share for 6/30/11			(28,429)	(26,126)
Issuance of shares under benefit plans			22,133	12,373
Purchase of shares for treasury			(40,138)	(13,309)
Balance at the end of the period	1,265,280	1,251,295	1,265,280	1,251,295
Noncontrolling Interests
Changes in equity
Balance at the beginning of the period			16,296	15,981
Other comprehensive income, net of tax:
Net income (loss)			(48)	41
Other comprehensive income (loss)			(520)	742
Comprehensive income			(568)	783
Balance at the end of the period	$ 15,728	$ 16,764	$ 15,728	$ 16,764