GOODWILL AND INTANGIBLE ASSETS (Other Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Finite Lived And Indefinite Intangible Assets [Line Items]
Gross carrying value	$ 75,837	$ 75,156
Accumulated amortization	(68,453)	(64,250)
Net carrying value	7,384	10,906
Amortization expense	3,981	6,365	7,386
Other intangible assets, net	6,200
Customer Lists [Member]
Finite Lived And Indefinite Intangible Assets [Line Items]
Gross carrying value	65,888	65,566
Accumulated amortization	(60,957)	(57,682)
Net carrying value	4,931	7,884
Noncompete Agreements [Member]
Finite Lived And Indefinite Intangible Assets [Line Items]
Gross carrying value	5,756	5,701
Accumulated amortization	(5,593)	(5,063)
Net carrying value	163	638
Developed technology [Member]
Finite Lived And Indefinite Intangible Assets [Line Items]
Gross carrying value	1,000	1,000
Accumulated amortization	(1,000)	(1,000)
Net carrying value		0
Other [Member]
Finite Lived And Indefinite Intangible Assets [Line Items]
Gross carrying value	3,193	2,889
Accumulated amortization	(903)	(505)
Net carrying value	2,290	2,384
Domain Names [Member]
Finite Lived And Indefinite Intangible Assets [Line Items]
Other intangible assets	400
Trademarks [Member]
Finite Lived And Indefinite Intangible Assets [Line Items]
Other intangible assets	$ 800
Minimum [Member]
Finite Lived And Indefinite Intangible Assets [Line Items]
Other intangible assets useful life	1 year
Maximum [Member]
Finite Lived And Indefinite Intangible Assets [Line Items]
Other intangible assets useful life	20 years