EQUITY (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 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	66,843	64,149
Other comprehensive (loss) income	(8,532)	29,911
Total comprehensive income (loss)	58,311	94,060
Cash dividends declared - $0.20 per share and $0.17 per share for the quarters ended March 31, 2013 and 2012, respectively	(16,590)	(14,229)
Cash dividends declared per share (in dollars per share)	$ 0.2	$ 0.17
Issuance of shares under benefit plans	16,283	12,654
Purchase of shares for treasury	(12,780)	(20,098)
Balance at the end of the period	1,403,545	1,265,629
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	66,806	64,243
Other comprehensive (loss) income	(8,645)	29,842
Total comprehensive income (loss)	58,161	94,085
Cash dividends declared - $0.20 per share and $0.17 per share for the quarters ended March 31, 2013 and 2012, respectively	(16,590)	(14,229)
Issuance of shares under benefit plans	16,283	12,654
Purchase of shares for treasury	(12,780)	(20,098)
Balance at the end of the period	1,387,447	1,249,358
Noncontrolling Interests
Changes in equity
Balance at the beginning of the period	15,948	16,296
Comprehensive income:
Net income including non-controlling interests	37	(94)
Other comprehensive (loss) income	113	69
Total comprehensive income (loss)	150	(25)
Cash dividends declared - $0.20 per share and $0.17 per share for the quarters ended March 31, 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	$ 16,098	$ 16,271