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Income Taxes (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017
Income Tax Disclosure [Line Items] |  |  |  |
Federal tax rate |  | 21.00% |  | 35.00%
Provisional tax expense |  |  |  | $ 13,000,000.0
Net deferred tax assets | $ 2,300,000 |  |  |
One-time mandatory repatriation tax | 1,200,000 |  |  |
Deferred tax liability | 1,100,000 |  |  |
Net tax impact | $ 10,700,000 |  |  |
Increase (decrease) to unrecognized tax interest |  | $ 700,000 | $ 700,000 |
Unrecognized tax interest |  | 10,900,000 | 10,200,000 |
Impact of effective tax rate if recognized |  | 2,100,000 | 4,100,000 |
Alternative minimum tax credit carry-forwards |  |  | 661,000 |
Change in valuation allowance on net deferred tax assets |  | 13,100,000 |  |
Valuation allowance |  | 47,056,000 | $ 33,946,000 |
Domestic Tax Authority [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Alternative minimum tax credit carry-forwards |  | 45,600,000 |  |
New Zealand [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Alternative minimum tax credit carry-forwards |  | 13,400,000 |  |
California [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Alternative minimum tax credit carry-forwards |  | 19,700,000 |  |
Hawaii [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Alternative minimum tax credit carry-forwards |  | 17,000,000.0 |  |
New Jersey [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Alternative minimum tax credit carry-forwards |  | 1,900,000 |  |
New York State [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Alternative minimum tax credit carry-forwards |  | 48,800,000 |  |
New York City [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Alternative minimum tax credit carry-forwards |  | 48,700,000 |  |
Minimum [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Uncertain tax position probable changes in next 12 months |  | 500,000 |  |
Maximum [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Uncertain tax position probable changes in next 12 months |  | $ 1,500,000 |  |

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