The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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The aggregate cost of goods produced and sold during the reporting period, excluding depreciation, depletion, and amortization.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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CONSOLIDATED FINANCIAL STATEMENT DETAILS (Details 2) (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
Revenue
Service revenue									$ 2,957,735us-gaap_SalesRevenueServicesNet	$ 2,869,822us-gaap_SalesRevenueServicesNet	$ 2,639,409us-gaap_SalesRevenueServicesNet
Product revenue									151,812us-gaap_SalesRevenueGoodsNet	153,165us-gaap_SalesRevenueGoodsNet	161,524us-gaap_SalesRevenueGoodsNet
Revenue	830,754us-gaap_Revenues	782,231us-gaap_Revenues	756,315us-gaap_Revenues	740,247us-gaap_Revenues	724,455us-gaap_Revenues	756,872us-gaap_Revenues	799,411us-gaap_Revenues	742,249us-gaap_Revenues	3,109,547us-gaap_Revenues	3,022,987us-gaap_Revenues	2,800,933us-gaap_Revenues
Cost of revenue
Cost of service revenue									757,194	884,189	833,374
Cost of product revenue									125,982	119,532	158,314
Cost of revenue	$ 238,517us-gaap_CostOfGoodsAndServicesSold	$ 224,695us-gaap_CostOfGoodsAndServicesSold	$ 210,730us-gaap_CostOfGoodsAndServicesSold	$ 209,234us-gaap_CostOfGoodsAndServicesSold	$ 222,421us-gaap_CostOfGoodsAndServicesSold	$ 249,888us-gaap_CostOfGoodsAndServicesSold	$ 273,938us-gaap_CostOfGoodsAndServicesSold	$ 257,474us-gaap_CostOfGoodsAndServicesSold	$ 883,176us-gaap_CostOfGoodsAndServicesSold	$ 1,003,721us-gaap_CostOfGoodsAndServicesSold	$ 991,688us-gaap_CostOfGoodsAndServicesSold