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Segment Information (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Segment Information                        
Number of reportable segments | segment                 3      
Net sales $ 231,681 $ 262,476 $ 263,002 $ 219,866 $ 200,192 $ 230,974 $ 229,973 $ 199,523 $ 977,025 $ 860,661 $ 794,059  
Income from operations 24,705 46,696 45,137 22,629 26,136 45,777 40,924 26,641 139,167 139,477 109,021  
Depreciation and amortization                 33,724 27,927 26,821  
Business Combination, Bargain Purchase, Gain Recognized, Amount                 6,336 0 0  
Significant non-cash charges                 13,908 13,946 11,958  
Provision for (benefit from) income taxes 10,829 $ 16,581 $ 16,712 $ 7,679 8,565 $ 15,898 $ 14,640 $ 10,063 51,801 49,166 40,791  
Capital expenditures and asset acquisitions, net of cash acquired                 85,962 47,363 38,365  
Total assets 1,037,523       979,974       1,037,523 979,974 961,309  
Cash and short-term investments 168,514       226,537       $ 168,514 226,537 258,825 $ 260,307
Administrative and all other                        
Segment Information                        
Lease term of entity's facilities in Vacaville                 10 years      
Net sales                 $ 0 0 0  
Income from operations                 677 (869) (775)  
Depreciation and amortization                 901 1,477 1,451  
Business Combination, Bargain Purchase, Gain Recognized, Amount                 0      
Significant non-cash charges                 2,473 3,657 2,355  
Provision for (benefit from) income taxes                 1,824 1,470 1,519  
Capital expenditures and asset acquisitions, net of cash acquired                 0 0 27  
Total assets (150,970)       (64,091)       (150,970) (64,091) 20,397  
Cash and short-term investments 80,200       137,400       80,200 137,400 164,100  
Intersegment elimination                        
Segment Information                        
Net sales                 24,911 31,772 24,284  
North America                        
Segment Information                        
Net sales                 803,697 742,021 676,618  
Income from operations                 132,890 137,311 109,446  
Depreciation and amortization                 25,745 19,433 17,812  
Business Combination, Bargain Purchase, Gain Recognized, Amount                 0      
Significant non-cash charges                 9,861 9,124 8,221  
Provision for (benefit from) income taxes                 47,434 45,547 36,999  
Capital expenditures and asset acquisitions, net of cash acquired                 70,040 37,652 33,336  
Total assets 953,033       853,826       953,033 853,826 748,241  
North America | Intersegment elimination                        
Segment Information                        
Net sales                 3,237 2,512 2,857  
Europe                        
Segment Information                        
Net sales                 165,155 111,274 108,068  
Income from operations                 4,421 895 3,795  
Depreciation and amortization                 5,832 5,809 5,773  
Business Combination, Bargain Purchase, Gain Recognized, Amount                 6,336      
Significant non-cash charges                 1,509 1,052 1,251  
Provision for (benefit from) income taxes                 2,124 1,428 1,692  
Capital expenditures and asset acquisitions, net of cash acquired                 11,411 8,461 4,177  
Total assets 208,640       165,121       208,640 165,121 168,305  
Europe | Intersegment elimination                        
Segment Information                        
Net sales                 959 570 931  
Asia/Pacific                        
Segment Information                        
Net sales                 8,173 7,366 9,373  
Income from operations                 1,179 2,140 (3,445)  
Depreciation and amortization                 1,246 1,208 1,785  
Business Combination, Bargain Purchase, Gain Recognized, Amount                 0      
Significant non-cash charges                 65 113 131  
Provision for (benefit from) income taxes                 419 721 581  
Capital expenditures and asset acquisitions, net of cash acquired                 4,511 1,250 825  
Total assets 26,820       $ 25,118       26,820 25,118 24,366  
Asia/Pacific | Intersegment elimination                        
Segment Information                        
Net sales                 20,715 $ 28,690 $ 20,496  
Foreign operating entities                        
Segment Information                        
Cash and short-term investments $ 86,500               $ 86,500      
Percentage of cash and cash equivalents 51.30%               51.30%