Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Line Items]
Income tax benefit due to change in tax rate	$ 3,000
Valuation allowance	71,157	$ 10,531	$ 9,900
Unrecognized tax benefits that would impact the effective tax rate	2,300
Unrealized increase in goodwill if realized	27,100
Unrecognized tax benefits, income tax penalties	(400)
Unrecognized tax benefits, interest on income taxes	4,500
Unrecognized tax benefits, interest on income taxes expense, net	1,700
Unrecognized tax benefits, income tax penalties accrued	8,600
Unrecognized tax benefits, interest on income taxes accrued	12,100
Federal
Income Tax Disclosure [Line Items]
Net operating loss carry-forwards	22,200
State
Income Tax Disclosure [Line Items]
Net operating loss carry-forwards	2,700
Foreign
Income Tax Disclosure [Line Items]
Net operating loss carry-forwards	23,700
Foreign | Switzerland
Income Tax Disclosure [Line Items]
Net operating loss carry-forwards	$ 700