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COMPONENTS OF THE COMPANY'S CONSOLIDATED BALANCE SHEETS Property and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, Gross | $ 309,303 | $ 290,005 |
Accumulated depreciation | 195,186 | 178,300 |
Depreciation | $ 18,918 | $ 18,374 | $ 16,812
Property and Equipment [Member] | Geographic Concentration Risk [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Concentration Risk, Percentage | 10.00% | 10.00% | 10.00%
Property and Equipment [Member] | Geographic Concentration Risk [Member] | United States of America |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, Gross | $ 167,600 | $ 159,500 | $ 155,100
Property and Equipment [Member] | Geographic Concentration Risk [Member] | THAILAND |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Concentration Risk, Percentage | 12.00% | 12.00% | 12.00%
Land |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, Gross | $ 20,288 | $ 20,288 |
Construction-in-progress |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, Gross | 21,696 | 15,353 |
Building and improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, Gross | 53,610 | 52,655 |
Machinery and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, Gross | 160,028 | 151,269 |
Computer software and hardware and office furniture and fixtures |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, Gross | $ 53,681 | $ 50,440 |
Minimum [Member] | Building and improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, Useful Life | 4 years | 4 years | 4 years
Minimum [Member] | Machinery and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, Useful Life | 2 years | 2 years | 2 years
Minimum [Member] | Computer software and hardware and office furniture and fixtures |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, Useful Life | 4 years | 4 years | 4 years
Maximum [Member] | Building and improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, Useful Life | 40 years | 40 years | 40 years
Maximum [Member] | Machinery and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, Useful Life | 8 years | 8 years | 8 years
Maximum [Member] | Computer software and hardware and office furniture and fixtures |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, Useful Life | 7 years | 7 years | 7 years

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