SUPPLEMENTAL CASH FLOW INFORMATION (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplemental Cash Flow Information [Abstract]
Fair Value Of Contingent Consideration At Date Of Acquisition	$ 8,800,000	$ 41,400,000
Cash paid (received) during the year for:
Interest	54,027,000	28,705,000	5,214,000
Income tax payments	63,521,000	112,087,000	43,316,000
Income tax refunds	$ (10,477,000)	$ (17,683,000)	$ (8,187,000)