PROPERTY AND EQUIPMENT (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Property plant and equipment	$ 828,141,000	$ 776,205,000
Less: accumulated depreciation	(561,323,000)	(520,720,000)
Property and equipment, net	266,818,000	255,485,000
Depreciation expense	78,700,000	72,500,000	76,600,000
Amortization expense for developed software	25,300,000	21,600,000	25,200,000
Sale-leasebacked amortization period (in years)		10 years
Land [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment	17,478,000	17,478,000
Buildings and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment	131,911,000	130,627,000
Developed software [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment	266,210,000	228,343,000
Internally Developed Software, Net	97,700,000	85,100,000
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment	$ 412,542,000	$ 399,757,000