SUPPLEMENTAL CASH FLOW & OTHER DATA (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Supplemental Cash Flow Elements [Abstract]
Depreciation expense	$ 48,810	$ 51,310	$ 151,705	$ 154,939
Amortization expense	20,159	19,961	59,278	60,361
Interest paid	51,767	47,390	135,738	129,380
Income taxes paid	127,294	89,338	332,232	292,147
Assets acquired under capital leases	0	1,215	2,411	4,170
Fair value of assets acquired	0		241,016	50,800
Fair value of liabilities assumed	0	0	10,962	269
Fair value of net assets acquired	0		230,054	50,531
Merger consideration paid (payable), net	(54)	6	(50,159)	43
Cash paid for business acquisitions	(54)	6	179,895	50,574
Less: Cash acquired	0	0	0	0
Business acquisitions, net of cash acquired	$ (54)	$ 6	$ 179,895	$ 50,574