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COMPONENTS OF THE COMPANY'S CONSOLIDATED BALANCE SHEETS (Notes) | 12 Months Ended
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Dec. 31, 2017
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, 2017 |  | December 31, 2016
Accounts receivable trade | $ | 58,718 |  |  | $ | 46,849 |
Accrued ship and debit | (39,486 | ) |  | (38,075 | )
Allowance for stock rotation and rebate | (1,700 | ) |  | (1,721 | )
Allowance for doubtful accounts | (734 | ) |  | (525 | )
Total | $ | 16,798 |  |  | $ | 6,528 |
Inventories
(in thousands) | December 31, 2017 |  | December 31, 2016
Raw materials | $ | 15,517 |  |  | $ | 14,610 |
Work-in-process | 16,765 |  |  | 15,194 |
Finished goods | 24,805 |  |  | 22,760 |
Total | $ | 57,087 |  |  | $ | 52,564 |
Prepaid Expenses and Other Current Assets
(in thousands) | December 31, 2017 |  | December 31, 2016
Prepaid income tax | $ | 460 |  |  | $ | 2,431 |
Prepaid legal fees | 213 |  |  | 212 |
Prepaid maintenance agreements | 856 |  |  | 1,399 |
Advance to suppliers | 1,211 |  |  | 69 |
Interest receivable | 1,195 |  |  | 743 |
Other | 3,823 |  |  | 3,861 |
Total | $ | 7,758 |  |  | $ | 8,715 |
Property and Equipment
(in thousands) | December 31, 2017 |  | December 31, 2016
Land | $ | 20,288 |  |  | $ | 20,288 |
Construction-in-progress | 15,353 |  |  | 6,880 |
Building and improvements | 52,655 |  |  | 52,156 |
Machinery and equipment | 151,269 |  |  | 132,162 |
Computer software and hardware and office furniture and fixtures | 50,440 |  |  | 45,951 |
| 290,005 |  |  | 257,437 |
Accumulated depreciation | (178,300 | ) |  | (162,141 | )
Total | $ | 111,705 |  |  | $ | 95,296 |
Depreciation expense for property and equipment for fiscal years ended December 31, 2017, 2016 and 2015, was approximately $18.4 million, $16.8 million and $16.5 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, 2017, 2016 and 2015, was approximately $159.5 million, $155.1 million and $150.1 million, respectively. In each of 2017, 2016 and 2015, 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, 2017:
(in thousands) | Unrealized Gains and Losses on Available-for-Sale Securities |  | Defined Benefit Pension Items |  | Foreign Currency Items |  | Total
Balance at January 1, 2015 | $ | 83 |  |  | $ | (1,240 | ) |  | $ | 21 |  |  | $ | (1,136 | )
Other comprehensive loss before reclassifications | (180 | ) |  | (469 | ) |  | (191 | ) |  | (840 | )
Amounts reclassified from accumulated other comprehensive loss | — |  |  | 125 |  | (1) | — |  |  | 125 |
Other comprehensive loss | (180 | ) |  | (344 | ) |  | (191 | ) |  | (715 | )
Balance at December 31, 2015 | (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 before reclassifications | (207 | ) |  | 502 |  |  | 79 |  |  | 374 |
Amounts reclassified from accumulated other comprehensive loss | — |  |  | 197 |  | (1) | — |  |  | 197 |
Other comprehensive income | (207 | ) |  | 699 |  |  | 79 |  |  | 571 |
Balance at December 31, 2017 | $ | (427 | ) |  | $ | (1,237 | ) |  | $ | (475 | ) |  | $ | (2,139 | )
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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, 2017, 2016 and 2015.

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