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COMPONENTS OF THE COMPANY'S CONSOLIDATED BALANCE SHEETS (Notes) | 12 Months Ended
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Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract] |
Supplemental Balance Sheet Disclosures [Text Block] | COMPONENTS OF THE COMPANY’S CONSOLIDATED BALANCE SHEETS Accounts Receivable
(in thousands) | December 31, 2018 |  | December 31, 2017
Accounts receivable trade | $ | 54,055 |  |  | $ | 58,718 |
Accrued ship and debit | (40,118 | ) |  | (39,486 | )
Allowance for stock rotation and rebate | (2,159 | ) |  | (1,700 | )
Allowance for doubtful accounts | (706 | ) |  | (734 | )
Total | $ | 11,072 |  |  | $ | 16,798 |
Inventories
(in thousands) | December 31, 2018 |  | December 31, 2017
Raw materials | $ | 41,138 |  |  | $ | 15,517 |
Work-in-process | 15,612 |  |  | 16,765 |
Finished goods | 24,107 |  |  | 24,805 |
Total | $ | 80,857 |  |  | $ | 57,087 |
Prepaid Expenses and Other Current Assets
(in thousands) | December 31, 2018 |  | December 31, 2017
Prepaid income tax | $ | 3,081 |  |  | $ | 460 |
Prepaid legal fees | 181 |  |  | 213 |
Prepaid maintenance agreements | 2,047 |  |  | 856 |
Advance to suppliers | 2,157 |  |  | 1,211 |
Interest receivable | 595 |  |  | 1,195 |
Other | 3,854 |  |  | 3,823 |
Total | $ | 11,915 |  |  | $ | 7,758 |
Property and Equipment
(in thousands) | December 31, 2018 |  | December 31, 2017
Land | $ | 20,288 |  |  | $ | 20,288 |
Construction-in-progress | 21,696 |  |  | 15,353 |
Building and improvements | 53,610 |  |  | 52,655 |
Machinery and equipment | 160,028 |  |  | 151,269 |
Computer software and hardware and office furniture and fixtures | 53,681 |  |  | 50,440 |
| 309,303 |  |  | 290,005 |
Accumulated depreciation | (195,186 | ) |  | (178,300 | )
Total | $ | 114,117 |  |  | $ | 111,705 |
Depreciation expense for property and equipment for fiscal years ended December 31, 2018, 2017 and 2016, was approximately $18.9 million, $18.4 million and $16.8 million, respectively, and was determined using the straight-line method over the following useful lives:
Building and improvements | 4-40 years
Machinery and equipment | 2-8 years
Computer software and hardware and office furniture and fixtures | 4-7 years
Total property and equipment (excluding accumulated depreciation) located in the United States at December 31, 2018, 2017 and 2016, was approximately $167.6 million, $159.5 million and $155.1 million, respectively. In each of 2018, 2017 and 2016, approximately 12% of total property and equipment (excluding accumulated depreciation) was held in Thailand by one of the Company’s subcontractors. No other country held 10% or more of total property and equipment in the periods presented. Accumulated Other Comprehensive Loss Changes in accumulated other comprehensive loss for the three years ended December 31, 2018:
(in thousands) | Unrealized Gains and Losses on Available-for-Sale Securities |  | Defined Benefit Pension Items |  | Foreign Currency Items |  | Total
Balance at January 1, 2016 | $ | (97 | ) |  | $ | (1,584 | ) |  | $ | (170 | ) |  | $ | (1,851 | )
Other comprehensive loss before reclassifications | (123 | ) |  | (505 | ) |  | (384 | ) |  | (1,012 | )
Amounts reclassified from accumulated other comprehensive loss | — |  |  | 153 |  | (1) | — |  |  | 153 |
Other comprehensive loss | (123 | ) |  | (352 | ) |  | (384 | ) |  | (859 | )
Balance at December 31, 2016 | (220 | ) |  | (1,936 | ) |  | (554 | ) |  | (2,710 | )
Other comprehensive income (loss) before reclassifications | (207 | ) |  | 502 |  |  | 79 |  |  | 374 |
Amounts reclassified from accumulated other comprehensive loss | — |  |  | 197 |  | (1) | — |  |  | 197 |
Other comprehensive loss | (207 | ) |  | 699 |  |  | 79 |  |  | 571 |
Balance at December 31, 2017 | (427 | ) |  | (1,237 | ) |  | (475 | ) |  | (2,139 | )
Other comprehensive income (loss) before reclassifications | 161 |  |  | 401 |  |  | (236 | ) |  | 326 |
Amounts reclassified from accumulated other comprehensive loss | — |  |  | 124 |  | (1) | — |  |  | 124 |
Other comprehensive income | 161 |  |  | 525 |  |  | (236 | ) |  | 450 |
Balance at December 31, 2018 | $ | (266 | ) |  | $ | (712 | ) |  | $ | (711 | ) |  | $ | (1,689 | )
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(1) | This component of accumulated other comprehensive loss is included in the computation of net periodic pension cost for the years ended December 31, 2018, 2017 and 2016.

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