INCOME TAXES (NARRATIVE) (DETAILS) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement Narrative [Line Items]
Total deferred tax assets, net	$ 34,758				$ 71,754				$ 34,758	$ 71,754
Valuation allowances	9,526				9,949				$ 9,526	9,949	$ 10,139	$ 10,721
Net Change in Valuation Allowance	600				400		$ 1,000	$ 100
Income Tax Holidays Description									The Company has been granted "Tax Holidays" as an incentive to attract foreign investment by the governments of the Philippines and Costa Rica. Generally, a Tax Holiday is an agreement between the Company and a foreign government under which the Company receives certain tax benefits in that country, such as exemption from taxation on profits derived from export-related activities. In the Philippines, the Company has been granted multiple agreements with an initial period of four years and additional periods for varying years, expiring at various times between 2017 and 2019.
Income Tax Holiday Termination Date									2017 and 2019
Aggregate Effect on Income Tax Expense for Income Tax Holiday Jurisdictions									$ 11,900	$ 12,400	$ 12,200
Diluted Net Income Per Share Effect For Income Tax Holiday Jurisdictions									$ 0.26	$ 0.27	$ 0.25
Total Interest and Penalties Accrued Related to Uncertain Tax Positions Recorded in Balance Sheets	1,800				$ 693				$ 1,800	$ 693	$ 709
Reserve for Uncertain Tax Benefits, Net									3,300	$ 3,500
Decrease of Unrecognized Tax Benefits over Next 12 Months	5,100								5,100
Decrease in Unrecognized Tax Benefits is Reasonably Possible	3,900								3,900
Tax Adjustments, Settlements, and Unusual Provisions	300	$ (200)	$ 700	$ (300)
Settlement with Taxing Authority [Member]
Income Statement Narrative [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions						$ 800
Expired statute of limitations [Member]
Income Statement Narrative [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions						$ 500	$ 300
State Tax Credits And Nol [Member]
Income Statement Narrative [Line Items]
Net Change in Valuation Allowance									100
United States
Income Statement Narrative [Line Items]
Total deferred tax assets, net	4,200								$ 4,200
Income Tax Examination Years Under Audit									2014 through 2016
Foreign Jurisdictions
Income Statement Narrative [Line Items]
Total deferred tax assets, net	$ 3,500								$ 3,500
Canada
Income Statement Narrative [Line Items]
Income Tax Examination Years Under Audit									2009 and 2010
United Kingdom Ireland Australia | Not Realizable Standard [Member]
Income Statement Narrative [Line Items]
Net Change in Valuation Allowance									$ 2,100
Argentina New Zealand Belgium Turkey UK | Not Realizable Standard [Member]
Income Statement Narrative [Line Items]
Net Change in Valuation Allowance									$ (2,500)