ACQUISITIONS (Details) (USD $)	12 Months Ended	0 Months Ended
	Dec. 31, 2014	Apr. 01, 2014 item	Dec. 31, 2013	Jan. 01, 2013
Intangible assets:
Goodwill	404,187,000		$ 404,302,000	$ 404,211,000
Non-compete agreements
Intangible assets:
Amortization period	5 years
Minus - 10
Acquisitions
Cash paid at closing		302,000
Net working capital liability		17,000
Deferred cash consideration		43,000
Fair value of contingent consideration	1,100,000	933,000
Total purchase price		1,295,000
Number of discrete measurement periods		7
Amount withheld as security at the acquisition date for potential indemnification claims		43,000
Fair value of contingent consideration in Long-term obligations	1,100,000
Intangible assets:
Acquired technology		1,142,000
Goodwill		153,000
Net assets acquired		$ 1,295,000
Amortization period	10 years