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Taxes - Additional Information (Details) - USD ($)
 12 Months Ended
Jul. 06, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Tax Credit Carryforward [Line Items]        
Domestic income from continuing operations before taxes   $ 30,080,000 $ 23,939,000 $ 11,637,000
Foreign income from continuing operations before taxes   236,842,000 $ 144,856,000 $ 115,325,000
Tax expense from write down of deferred tax assets   12,523,000    
Estimated tax expense   101,379,000    
Decrease in tax expense   $ 3,843,000    
Income tax rate   35.00% 35.00% 35.00%
Foreign tax rate differential   27.00% 17.00% 19.00%
Reduction of income tax expense for adoption of ASU 2016-09   $ 38,569,000 $ 11,889,000  
Discrete tax benefit related to employee stock option exercises   14.00% 7.00% 0.00%
Net cash provided by operating activities   $ 224,323,000 $ 182,081,000 $ 128,327,000
Net cash used in financing activities   100,121,000 29,231,000 116,831,000
Income tax penalties and interest expense   71,000 92,000 34,000
Deferred tax liabilities, gross   7,516,000 6,389,000  
Reserve for income taxes   6,488,000 5,361,000  
Unrecognized tax benefit shown as a reduction to noncurrent deferred tax assets   1,028,000 1,028,000  
Interest and penalties, gross   767,000 670,000  
Minimum decrease in income tax expense due to release in reserves   1,000,000    
Maximum decrease in income tax expense due to release in reserves   1,200,000    
Net non-current deferred tax liabilities   (312,000) 0  
Non deductible federal and state liabilities   87,000 379,000  
Income tax paid net   $ 11,802,000 $ 20,748,000 58,280,000
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   $ 1,193,000    
State Research And Experimentation [Member]        
Tax Credit Carryforward [Line Items]        
Deferred tax assets, tax credit carryforwards, research   7,735,000    
Sisd [Member] | Discontinued Operations, Disposed of by Sale [Member]        
Tax Credit Carryforward [Line Items]        
Gain (loss) on sale of discontinued business $ 125,357,000 0 $ (404,000) 125,357,000
Income tax expense (benefit) on discontinued operations $ 47,175,000 $ 0 (149,000) 47,801,000
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   $ 498,653,000 437,691,000  
Accounting Standards Update 2016-09, Statutory Tax Withholding Component [Member]        
Tax Credit Carryforward [Line Items]        
Net cash used in financing activities     $ 9,964,000 $ 7,871,000