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Segment Information (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
segment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Segment Information                        
Number of reportable segments | segment                 3      
Net sales $ 200,192 $ 230,974 $ 229,973 $ 199,523 $ 184,764 $ 216,139 $ 216,665 $ 176,491 $ 860,661 $ 794,059 $ 752,148  
Income from operations 26,136 45,777 40,924 26,641 22,485 35,249 35,009 16,277 139,477 109,021 99,276  
Depreciation and amortization                 27,927 26,821 27,918  
Impairment of Long-Lived Assets to be Disposed of                     530  
Significant non-cash charges                 13,946 11,958 13,190  
Provision for (benefit from) income taxes 8,565 $ 15,898 $ 14,640 $ 10,063 7,675 $ 13,479 $ 13,446 $ 6,191 49,166 40,791 35,791  
Capital expenditures and asset acquisitions, net of cash acquired                 47,363 38,365 23,935  
Total assets 979,974       961,309       979,974 961,309 973,065  
Cash and short-term investments 226,537       258,825       $ 226,537 258,825 260,307 $ 251,208
Administrative and all other                        
Segment Information                        
Lease term of entity's facilities in Vacaville                 10 years      
Net sales                 $ 0 0 0  
Income from operations                 (869) (775) 949  
Depreciation and amortization                 1,477 1,451 1,480  
Impairment of Long-Lived Assets to be Disposed of                     0  
Significant non-cash charges                 3,657 2,355 2,101  
Provision for (benefit from) income taxes                 1,470 1,519 2,185  
Capital expenditures and asset acquisitions, net of cash acquired                 0 27 0  
Total assets (64,091)       20,397       (64,091) 20,397 83,664  
Cash and short-term investments 137,400       164,100       137,400 164,100 167,400  
Intersegment elimination                        
Segment Information                        
Net sales                 31,772 24,284 23,237  
North America                        
Segment Information                        
Net sales                 742,021 676,618 613,843  
Income from operations                 137,311 109,446 94,888  
Depreciation and amortization                 19,433 17,812 18,129  
Impairment of Long-Lived Assets to be Disposed of                     0  
Significant non-cash charges                 9,124 8,221 9,722  
Provision for (benefit from) income taxes                 45,547 36,999 30,287  
Capital expenditures and asset acquisitions, net of cash acquired                 37,652 33,336 20,160  
Total assets 853,826       748,241       853,826 748,241 679,844  
North America | Intersegment elimination                        
Segment Information                        
Net sales                 2,512 2,857 4,134  
Europe                        
Segment Information                        
Net sales                 111,274 108,068 123,177  
Income from operations                 895 3,795 5,005  
Depreciation and amortization                 5,809 5,773 6,755  
Impairment of Long-Lived Assets to be Disposed of                     530  
Significant non-cash charges                 1,052 1,251 1,164  
Provision for (benefit from) income taxes                 1,428 1,692 2,437  
Capital expenditures and asset acquisitions, net of cash acquired                 8,461 4,177 2,977  
Total assets 165,121       168,305       165,121 168,305 180,005  
Europe | Intersegment elimination                        
Segment Information                        
Net sales                 570 931 1,170  
Asia/Pacific                        
Segment Information                        
Net sales                 7,366 9,373 15,128  
Income from operations                 2,140 (3,445) (1,566)  
Depreciation and amortization                 1,208 1,785 1,554  
Impairment of Long-Lived Assets to be Disposed of                     0  
Significant non-cash charges                 113 131 203  
Provision for (benefit from) income taxes                 721 581 882  
Capital expenditures and asset acquisitions, net of cash acquired                 1,250 825 798  
Total assets 25,118       $ 24,366       25,118 24,366 29,552  
Asia/Pacific | Intersegment elimination                        
Segment Information                        
Net sales                 28,690 $ 20,496 $ 17,933  
Foreign operating entities                        
Segment Information                        
Cash and short-term investments $ 87,200               $ 87,200      
Percentage of cash and cash equivalents 38.50%               38.50%