Income Taxes (Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Examination [Line Items]
Tax credit carryforwards, research	$ 8,300	$ 8,300
Deferred tax asset valuation allowance	16,889	16,889	$ 8,754	$ 6,388	$ 6,202
Current foreign tax expense (benefit)		26,604	$ 27,418	24,537
Tax credit carryforwards, AMT	500	$ 500
Effective income tax rate		20.70%	39.50%
Deferred tax liabilities, undistributed foreign earnings	1,800	$ 1,800	$ 3,100
Tax Cuts and Jobs Act of 2017, income tax expense (benefit)	200	200
Provisional income tax benefit		7,500
Change in tax rate, deferred tax asset, provisional income tax expense		7,700
Unrecognized tax benefits that would impact effective tax rate	9,600	9,600
Unrecognized tax benefits that would result in adjustments to other tax accounts	200	200
Unrecognized tax benefits, income tax penalties and interest accrued	500	500	600
Unrecognized tax benefits, income tax penalties and interest expense (benefit)		(100)	200	$ (900)
Minimum amount of unrecognized tax benefits that could be recognized over next 12 months	1,800	1,800
Arizona
Income Tax Examination [Line Items]
State operating loss carryforwards	8,400	8,400
State and Local Jurisdiction
Income Tax Examination [Line Items]
Deferred tax asset valuation allowance	16,900	16,900	8,800
Minimum
Income Tax Examination [Line Items]
State operating loss carryforwards	3,700	3,700
Maximum
Income Tax Examination [Line Items]
State operating loss carryforwards	6,100	6,100
China
Income Tax Examination [Line Items]
Current foreign tax expense (benefit)		3,700
Deferred tax liabilities, undistributed foreign earnings	$ 1,800	$ 1,800	$ 3,100