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SEGMENT INFORMATION (REVENUE GEOGRAPHY) (DETAILS) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 338,170us-gaap_SalesRevenueServicesNet	$ 305,900us-gaap_SalesRevenueServicesNet	$ 295,490us-gaap_SalesRevenueServicesNet	$ 302,221us-gaap_SalesRevenueServicesNet	$ 318,087us-gaap_SalesRevenueServicesNet	$ 296,995us-gaap_SalesRevenueServicesNet	$ 289,692us-gaap_SalesRevenueServicesNet	$ 288,383us-gaap_SalesRevenueServicesNet	$ 1,241,781us-gaap_SalesRevenueServicesNet	$ 1,193,157us-gaap_SalesRevenueServicesNet	$ 1,162,981us-gaap_SalesRevenueServicesNet
Property, plant and equipment, gross	628,351us-gaap_PropertyPlantAndEquipmentGross				575,499us-gaap_PropertyPlantAndEquipmentGross				628,351us-gaap_PropertyPlantAndEquipmentGross	575,499us-gaap_PropertyPlantAndEquipmentGross	555,054us-gaap_PropertyPlantAndEquipmentGross
Other long-term assets	36,658us-gaap_OtherAssetsNoncurrent				45,726us-gaap_OtherAssetsNoncurrent				36,658us-gaap_OtherAssetsNoncurrent	45,726us-gaap_OtherAssetsNoncurrent	46,784us-gaap_OtherAssetsNoncurrent
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									603,297	556,239	474,236
Property, plant and equipment, gross	382,508				337,311				382,508	337,311	311,904
Other long-term assets	27,728				34,891				27,728	34,891	35,978
Philippines [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									348,339	354,942	334,541
Property, plant and equipment, gross	119,482				101,123				119,482	101,123	107,676
Other long-term assets	5,202				4,408				5,202	4,408	4,124
Latin America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									172,270	176,906	188,071
Property, plant and equipment, gross	67,193				75,618				67,193	75,618	70,915
Other long-term assets	1,456				5,299				1,456	5,299	4,696
Europe Middle East Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									83,944	72,644	111,304
Property, plant and equipment, gross	13,367				12,311				13,367	12,311	8,767
Other long-term assets	692				311				692	311	887
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									28,294	18,489	17,652
Property, plant and equipment, gross	26,502				28,195				26,502	28,195	29,884
Other long-term assets	1,309				779				1,309	779	1,004
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									5,637	13,937	37,177
Property, plant and equipment, gross	19,299				20,941				19,299	20,941	25,908
Other long-term assets	$ 271				$ 38				$ 271	$ 38	$ 95