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