Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2038	Dec. 31, 2022	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Line Items]
Income tax expense (benefit) for discontinued operations				$ 200
Tax Cuts and Jobs Act of 2017, income tax expense	$ 28,400
Tax Cuts and Jobs Act of 2017, remeasurement of deferred tax assets and liabilities	36,000	$ 36,000
Tax Cuts and Jobs Act of 2017, transition tax for accumulated foreign earnings, income tax expense	29,100	29,100
Tax Cuts and Jobs Act of 2017, valuation allowance against foreign tax credit carryforward	(35,300)	(35,300)
Tax Cuts and Jobs Act of 2017, income tax expense related to employee compensation	0
Income tax benefit from domestic permanent differences and tax credits		48,200
Income tax benefit from domestic permanent differences and tax credits, non-taxable translation gain		27,100
Income tax benefit from foreign jurisdiction tax credits		$ 19,800
Statutory tax rates		35.00%	35.00%	35.00%
Foreign tax rate differences benefit in income tax		$ 13,000	$ 17,700	$ 3,400
Income tax expense tax holiday		3,500	2,900
Net operating loss carryforwards	538,880	538,880
Net tax credit carryforwards	97,100	97,100
Operating loss carryforwards that will be used in expiration periods	158,600	158,600
Net tax credit carryforwards that will expire	97,072	97,072
Net tax credit carry forwards with indefinite carry forward period	6,600	6,600
Net tax credit carryforwards that expected to be utilized prior to expiry	58,400	58,400
Net decrease in reserve for uncertain tax positions		1,900
Balance at end of the year of unrecognized tax benefits	8,579	8,579	10,474	7,293
Estimate the range of reasonably possible changes to unrecognized tax positions	1,100	1,100
Recognized interest expense (income) and penalties of unrecognized tax benefits		0	(200)	$ 0
Accrued interest expense (income) and penalties of unrecognized tax benefits	0	0	$ 1,200
Scenario, Forecast [Member]
Income Taxes [Line Items]
Net tax credit carryforwards that will expire					$ 85,600	$ 4,700	$ 100	$ 100
Net Operating Loss Carry Forwards Expires In 2017 [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	1,000	1,000
Net Operating Loss Carry Forwards Expires In 2018 [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	200	200
Net Operating Loss Carry Forwards Expires In 2019 [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	7,900	7,900
2020 and 2022 [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	33,700	33,700
2023 and 2038 [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	143,400	143,400
Net Operating Loss Carry Forward Indefinite Period [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	352,700	$ 352,700
Germany [Member]
Income Taxes [Line Items]
Statutory tax rates		28.00%
Net operating loss carryforwards	14,127	$ 14,127
Canada [Member]
Income Taxes [Line Items]
Statutory tax rates		26.00%
Net tax credit carryforwards that will expire	22,459	$ 22,459
Netherlands [Member]
Income Taxes [Line Items]
Statutory tax rates		25.00%
Net operating loss carryforwards	$ 13,063	$ 13,063