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Intangible Assets Other Than Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Goodwill [Table Text Block] | Intangible assets other than goodwill consist primarily of licenses, product lines, customer relationships and trademarks. Amortized intangible assets are included in intangibles in the accompanying consolidated balance sheets. Trademarks are disclosed separately in the accompanying consolidated balance sheets. Intangible assets are as follows (in thousands, except for weighted useful lives):
|  |  |  |  | December 31, 2020 |  |  | December 31, 2019 |
|  | Weighted Useful Lives |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Amount |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Amount |
|  | (Years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized Intangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Licenses |  | 5.81 |  |  | $ | 20,130 |  |  | $ | (20,130 | ) |  | $ | — |  |  | $ | 20,130 |  |  | $ | (19,988 | ) |  | $ | 142 |
Product lines |  | 10.36 |  |  |  | 33,858 |  |  |  | (31,827 | ) |  |  | 2,031 |  |  |  | 33,858 |  |  |  | (30,812 | ) |  |  | 3,046 |
Customer relationships |  | 4.90 |  |  |  | 3,152 |  |  |  | (3,152 | ) |  |  | — |  |  |  | 3,152 |  |  |  | (3,152 | ) |  |  | — |
Trade names |  | 5.00 |  |  |  | 3,000 |  |  |  | (3,000 | ) |  |  | — |  |  |  | 3,000 |  |  |  | (3,000 | ) |  |  | — |
Non-compete agreements |  | 5.00 |  |  |  | 200 |  |  |  | (200 | ) |  |  | — |  |  |  | 200 |  |  |  | (200 | ) |  |  | — |
Total amortized intangible assets |  |  |  |  | $ | 60,340 |  |  | $ | (58,309 | ) |  | $ | 2,031 |  |  | $ | 60,340 |  |  | $ | (57,152 | ) |  | $ | 3,188 |
Unamortized Intangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  |  |  |  | $ | 300 |  |  | $ | — |  |  | $ | 300 |  |  | $ | 300 |  |  | $ | — |  |  | $ | 300 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | For the year ended December 31, 2020, 2019 and 2018, the Company’s aggregate amortization expense related to intangible assets was $1.2 million, $4.7 million and $4.9 million, respectively. The Company currently estimates continuing future amortization expense to be approximately (in thousands):
2021 |  | $ | 1,015 |
2022 |  |  | 1,016 |
|  | $ | 2,031 |

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