Taxes - Additional Information (Details) - USD ($)		12 Months Ended
	Jul. 06, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Tax Credit Carryforward [Line Items]
Domestic income from continuing operations before taxes		$ 23,939,000	$ 11,637,000	$ 25,585,000
Foreign income from continuing operations before taxes		$ 144,856,000	$ 115,325,000	$ 106,171,000
Income tax rate		35.00%	35.00%	35.00%
Foreign tax rate differential		17.00%	19.00%	19.00%
Undistributed earnings of foreign subsidiaries		$ 498,238,000
Deferred tax liability not recognized, on undistributed earnings of foreign subsidiaries		151,966,000
Reduction of income tax expense for adoption of ASU 2016-09		$ 11,889,000
Discrete tax benefit related to employee stock option exercises		7.00%	0.00%	0.00%
Net cash provided by operating activities		$ 182,081,000	$ 128,327,000	$ 163,841,000
Net cash used in financing activities		29,231,000	116,831,000	42,743,000
Income tax penalties and interest expense		92,000	34,000
Deferred tax liabilities, gross		6,389,000	5,858,000
Reserve for income taxes		5,361,000	4,830,000
Unrecognized tax benefit shown as a reduction to noncurrent deferred tax assets		1,028,000	1,028,000
Interest and penalties, gross		670,000	562,000
Minimum decrease in income tax expense due to release in reserves		950,000
Maximum decrease in income tax expense due to release in reserves		1,050,000
Net non-current deferred tax liabilities		0	(319,000)
Non deductible federal and state liabilities		379,000	1,198,000
Income tax paid net		$ 20,748,000	$ 58,280,000	17,549,000
Open Tax Year State Authorities		2013 through 2016
Open tax year United States Internal Revenue Service		2013 through 2016
Open tax year, various taxing authorities		2012 through 2016
Tax Years Covered Through Advanced Pricing Agreement			2006 through 2011
Tax years for APA agreement		Between 2014 and 2018
State research and experimentation tax carryforwards		2014 through 2016
Research Tax Credit Carryforward [Member]
Tax Credit Carryforward [Line Items]
Deferred tax assets, valuation allowance		$ 857,000
State Research And Experimentation [Member]
Tax Credit Carryforward [Line Items]
Deferred tax assets, tax credit carryforwards, research		6,181,000
Sisd [Member] | Discontinued Operations, Disposed of by Sale [Member]
Tax Credit Carryforward [Line Items]
Gain (loss) on sale of discontinued business	$ 125,357,000	(404,000)	$ 125,357,000	0
Income tax expense (benefit) on discontinued operations	$ 47,175,000	$ (149,000)	47,801,000	4,997,000
Revenue Commissioners, Ireland [Member] | Foreign Tax Authority [Member]
Tax Credit Carryforward [Line Items]
Income tax rate		12.50%
State Administration of Taxation, China [Member] | Foreign Tax Authority [Member]
Tax Credit Carryforward [Line Items]
Income tax rate		25.00%
Non-US [Member]
Tax Credit Carryforward [Line Items]
Cash, cash equivalents, and investments		$ 437,691,000	352,621,000
Accounting Standards Update 2016-09, Statutory Tax Withholding Component [Member]
Tax Credit Carryforward [Line Items]
Net cash provided by operating activities			9,964,000	7,871,000
Net cash used in financing activities			9,964,000	$ 7,871,000
Accounting Standards Update 2015-17 [Member]
Tax Credit Carryforward [Line Items]
Deferred tax assets, current			7,104,000
Net non-current deferred tax liabilities			$ 319,000