EQUITY (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Changes in equity
Balance at the beginning of the period			$ 1,358,321	$ 1,193,242
Comprehensive income:
Net income including non-controlling interests	72,527	66,365	139,370	130,514
Other comprehensive loss	(15,904)	(26,225)	(24,436)	3,686
Total comprehensive income (loss)	56,623	40,140	114,934	134,200
Cash dividends declared - $0.40 per share and $0.34 per share for the six months ended June 30, 2013 and 2012, respectively			(33,030)	(28,429)
Cash dividends declared per share (in dollars per share)	$ 0.2	$ 0.17	$ 0.40	$ 0.34
Issuance of shares under benefit plans			23,907	22,133
Purchase of shares for treasury			(69,677)	(40,138)
Balance at the end of the period	1,394,455	1,281,008	1,394,455	1,281,008
Shareholders' Equity
Changes in equity
Balance at the beginning of the period			1,342,373	1,176,946
Comprehensive income:
Net income including non-controlling interests			139,412	130,562
Other comprehensive loss			(24,387)	4,206
Total comprehensive income (loss)			115,025	134,768
Cash dividends declared - $0.40 per share and $0.34 per share for the six months ended June 30, 2013 and 2012, respectively			(33,030)	(28,429)
Issuance of shares under benefit plans			23,907	22,133
Purchase of shares for treasury			(69,677)	(40,138)
Balance at the end of the period	1,378,598	1,265,280	1,378,598	1,265,280
Noncontrolling Interests
Changes in equity
Balance at the beginning of the period			15,948	16,296
Comprehensive income:
Net income including non-controlling interests			(42)	(48)
Other comprehensive loss			(49)	(520)
Total comprehensive income (loss)			(91)	(568)
Cash dividends declared - $0.40 per share and $0.34 per share for the six months ended June 30, 2013 and 2012, respectively			0	0
Issuance of shares under benefit plans			0	0
Purchase of shares for treasury			0	0
Balance at the end of the period	$ 15,857	$ 15,728	$ 15,857	$ 15,728