GOODWILL AND INTANGIBLE ASSETS (Other Intangible Assets) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite Lived And Indefinite Intangible Assets [Line Items]
Gross carrying value	$ 150,382,000	$ 75,837,000
Accumulated amortization	(71,745,000)	(68,453,000)
Net carrying value	78,637,000	7,384,000
Prepaid patent and trademark fees	900,000	900,000
Other intangible assets, net	77,200,000
Amortization expense	3,496,000	3,981,000	6,365,000
Customer lists
Finite Lived And Indefinite Intangible Assets [Line Items]
Gross carrying value	131,943,000	65,888,000
Accumulated amortization	(63,564,000)	(60,957,000)
Net carrying value	68,379,000	4,931,000
Non-compete agreements
Finite Lived And Indefinite Intangible Assets [Line Items]
Gross carrying value	9,436,000	5,756,000
Accumulated amortization	(5,851,000)	(5,593,000)
Net carrying value	3,585,000	163,000
Developed technology
Finite Lived And Indefinite Intangible Assets [Line Items]
Gross carrying value	1,000,000	1,000,000
Accumulated amortization	(1,000,000)	(1,000,000)
Net carrying value	0	0
Other
Finite Lived And Indefinite Intangible Assets [Line Items]
Gross carrying value	8,003,000	3,193,000
Accumulated amortization	(1,330,000)	(903,000)
Net carrying value	6,673,000	2,290,000
Domain Names
Finite Lived And Indefinite Intangible Assets [Line Items]
Other intangible assets	400,000
Trademarks
Finite Lived And Indefinite Intangible Assets [Line Items]
Other intangible assets	1,000,000
Minimum
Finite Lived And Indefinite Intangible Assets [Line Items]
Other intangible assets useful life (in years)	1 year
Maximum
Finite Lived And Indefinite Intangible Assets [Line Items]
Other intangible assets useful life (in years)	20 years
Business Acquisitions | Customer lists
Finite Lived And Indefinite Intangible Assets [Line Items]
Other intangible assets, net	65,600,000
Business Acquisitions | Trade names
Finite Lived And Indefinite Intangible Assets [Line Items]
Other intangible assets, net	4,400,000
Business Acquisitions | Non-compete agreements
Finite Lived And Indefinite Intangible Assets [Line Items]
Other intangible assets, net	$ 3,700,000