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v3.19.1

Investments and Fair Value Measurements - Investment Category and Length (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) subsidiary company | Mar. 31, 2018 subsidiary company | Dec. 31, 2018 USD ($) company
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |
Fair value, in loss position less than twelve months |  |  | $ 9,892,000
Gross unrealized loss, in loss position less than twelve months |  |  | (32,000)
Fair value, in loss position greater than twelve months | $ 13,066,000 |  | 12,935,000
Gross unrealized loss, in loss position greater than twelve months | (27,000) |  | (52,000)
Fair value, total in loss position | 13,066,000 |  | 22,827,000
Gross unrealized loss, total in loss position | (27,000) |  | (84,000)
Minority Investments |  |  |
Investments, equity method | $ 4,276,000 |  | $ 3,958,000
Number of consolidated subsidiaries | subsidiary | 1 | 1 |
Number of equity method investments | company | 5 | 5 | 7
Impairment charge | $ 1,100,000 |  | $ 0
Xilingol Tongli Germanium Co. Ltd Investment |  |  |
Minority Investments |  |  |
Ownership (as a percent) | 25.00% |  |
Xilingol Tongli Germanium Co. Ltd Investment | Xilingol Tongli Germanium Co. Ltd Investment |  |  |
Minority Investments |  |  |
Investments, equity method | $ 0 |  | 1,700,000
Ownership (as a percent) | 25.00% |  |
Certificates of Deposit [Member] |  |  |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |
Fair value, in loss position less than twelve months |  |  | 717,000
Gross unrealized loss, in loss position less than twelve months |  |  | (3,000)
Fair value, in loss position greater than twelve months | $ 4,477,000 |  | 3,746,000
Gross unrealized loss, in loss position greater than twelve months | (13,000) |  | (24,000)
Fair value, total in loss position | 4,477,000 |  | 4,463,000
Gross unrealized loss, total in loss position | (13,000) |  | (27,000)
Corporate Bonds [Member] |  |  |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |
Fair value, in loss position less than twelve months |  |  | 9,175,000
Gross unrealized loss, in loss position less than twelve months |  |  | (29,000)
Fair value, in loss position greater than twelve months | 8,589,000 |  | 9,189,000
Gross unrealized loss, in loss position greater than twelve months | (14,000) |  | (28,000)
Fair value, total in loss position | 8,589,000 |  | 18,364,000
Gross unrealized loss, total in loss position | (14,000) |  | (57,000)
Other assets |  |  |
Minority Investments |  |  |
Investments, equity method | $ 6,900,000 |  | $ 8,400,000

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