PROPERTY PLANT AND EQUIPMENT (PPE BREAKOUT BY TYPE TABLE) (DETAILS) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property Plant and Equipment Line Items
Property, plant and equipment, gross	$ 555,054	$ 535,191
Less: Accumulated depreciation and amortization	(442,778)	(434,870)
Property, plant and equipment, net	112,276	100,321
Land and buildings [Member]
Property Plant and Equipment Line Items
Property, plant and equipment, gross	38,833	38,846
Computer equipment and software [Member]
Property Plant and Equipment Line Items
Property, plant and equipment, gross	279,129	261,378
Telephone equipment [Member]
Property Plant and Equipment Line Items
Property, plant and equipment, gross	42,914	44,861
Furniture and fixtures [Member]
Property Plant and Equipment Line Items
Property, plant and equipment, gross	50,322	51,460
Leasehold improvements [Member]
Property Plant and Equipment Line Items
Property, plant and equipment, gross	143,051	138,117
Motor vehicles [Member]
Property Plant and Equipment Line Items
Property, plant and equipment, gross	355	190
Construction-in-progress and other [Member]
Property Plant and Equipment Line Items
Property, plant and equipment, gross	$ 450	$ 339