Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Tax cuts and jobs act of 2017 complete accounting deemed repatriation federal tax	$ 5,200
Tax cuts and jobs act of 2017 complete accounting estimated payments of liability	1,000
Deferred Tax Assets, Gross	99,188	$ 40,525
Deferred Tax Assets, Valuation Allowance	$ 81,795	4,276
Cumulative loss incurred over the period	4 years
Deferred Tax Assets, Tax Credit Carryforwards	$ 5,326	7,879
Operating Loss Carryforwards	25,600
Deferred Tax, Operating Loss Carryforwards	44,358	5,371
Liability for uncertain tax positions	300	200
Cash Refunds from Income Taxes	14,900
Paid Cash for Income Taxes		17,200	$ 27,300
Foreign Income Tax Credit
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards	4,500
U.S
Operating Loss Carryforwards [Line Items]
Research and development credit carryforwards	700
U.S | Foreign Income Tax Credit
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards	$ 3,800
Tax credit carryforward expiration year	2022
Foreign Tax Authority | CA
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 28,400
Foreign Tax Authority | Iceland And Poland
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 8,800
Foreign Tax Authority | Iceland And Poland | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carry forwards expire period	5 years
Foreign Tax Authority | Iceland And Poland | Maximum
Operating Loss Carryforwards [Line Items]
Operating loss carry forwards expire period	10 years
Foreign Tax Authority | CA
Operating Loss Carryforwards [Line Items]
Operating loss carry back period	3 years
Operating loss carryforwards period	20 years
Foreign Tax Authority | Foreign Income Tax Credit | United Kingdom
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards	$ 700
State and Foreign
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	371,200	55,200
Deferred Tax, Operating Loss Carryforwards	44,400	$ 5,400
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 181,500
State and Local Jurisdiction | Latest Tax Year
Operating Loss Carryforwards [Line Items]
Tax credit carryforward expiration year	2020
State and Local Jurisdiction | Earliest Tax Year
Operating Loss Carryforwards [Line Items]
Tax credit carryforward expiration year	2039