Income Taxes Effective tax rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract]
GILTItaxexpense	$ 6,118	$ 2,363	$ 0
GILTItaxexpensepercent	5.30%	10.60%	0.00%
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	$ 114,707	$ 22,374	$ 51,283
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	24,088	4,699	17,950
Income Tax Reconciliation, State and Local Income Taxes	1,269	927	(403)
Income Tax Reconciliation, Tax Credits	(2,896)	(4,961)	(2,783)
Income Tax Reconciliation, Foreign Income Tax Rate Differential	$ (5,939)	$ (2,944)	$ 3,481
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	35.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes	1.10%	4.10%	(0.80%)
Effective Income Tax Rate Reconciliation, Tax Credits	(2.50%)	(22.20%)	(5.40%)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential	(5.20%)	(13.20%)	6.80%
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount	$ (8,446)	$ (11,040)	$ (18,958)
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Percent	(7.40%)	(49.30%)	(37.00%)
Effective Income Tax Rate, Continuing Operations	11.90%	(28.70%)	(33.80%)
Tax reform	$ 0	$ 826	$ 3,076
EffectiveIncomeTaxRateREconciliationTaxReform	0	0.037	0.060
EffectiveIncomeTaxRateReconciliationIPMigration	$ (2,118)	$ 3,252	$ 3,367
EffectiveTaxRateReconciliationIPMigrationPercent	(0.018)	0.145	0.066
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	$ 1,393	$ 3	$ 1,125
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	1.20%	0.10%	2.20%
EffectiveIncomeTaxRateReconciliationBargainPurchaseGain	$ 0	$ 0	$ (24,811)
EffectiveTaxRateReconciliationBargainPurchaseGainPercent	0	0	(0.484)
Effectiveincometaxreconciliation,nondeductiblecompensation	$ 203	$ 456	$ 595
Effectivetaxratereconciliationnondeductiblecomppercent	0.20%	2.00%	1.20%
Income Tax Expense (Benefit)	$ 13,672	$ (6,419)	$ (17,361)