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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
segment
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Segment Information                        
Number of reportable segments                 3      
Segment Information                        
Net sales $ 144,686 $ 172,113 $ 181,703 $ 158,734 $ 130,732 $ 162,366 $ 177,812 $ 132,536 $ 657,236 $ 603,446 $ 555,487  
Sales to Other Segments                 21,272 16,739 13,270  
Income (loss) from operations (937) 21,990 27,148 13,508 5,684 24,882 31,208 12,283 61,709 74,057 78,424  
Depreciation and amortization                 26,857 20,751 22,861  
Impairment of Goodwill                 2,346 1,282 6,292  
Impairment of long-lived assets                 803 1,094 419  
Significant non-cash charges                 10,667 6,837 3,689  
Provision for (benefit from) income taxes (6,785) 9,069 11,347 6,372 818 10,052 11,754 5,263 20,003 27,886 33,239  
Capital expenditures and asset acquisitions, net of cash acquired                 87,440 77,916 33,555  
Total Assets 890,322       836,087       890,322 836,087 874,709  
Cash and short-term investments 175,553       213,817       175,553 213,817 335,049 250,381
North America
                        
Segment Information                        
Net sales                 522,895 474,722 444,622  
Sales to Other Segments                 5,121 4,805 3,994  
Income (loss) from operations                 71,586 75,350 81,007  
Depreciation and amortization                 16,317 13,194 13,588  
Impairment of long-lived assets                 461 1,094    
Significant non-cash charges                 7,369 4,464 2,645  
Provision for (benefit from) income taxes                 15,037 25,348 28,712  
Capital expenditures and asset acquisitions, net of cash acquired                 23,014 72,291 26,305  
Total Assets 583,501       540,082       583,501 540,082 557,762  
Europe
                        
Segment Information                        
Net sales                 122,549 118,246 101,314  
Sales to Other Segments                 430 575 136  
Income (loss) from operations                 (8,095) 1,296 (3,674)  
Depreciation and amortization                 7,744 4,849 4,626  
Impairment of Goodwill                 2,346 1,282 6,292  
Impairment of long-lived assets                 342   419  
Significant non-cash charges                 1,053 966 390  
Provision for (benefit from) income taxes                 3,544 2,588 2,440  
Capital expenditures and asset acquisitions, net of cash acquired                 63,510 5,062 6,370  
Total Assets 194,000       180,016       194,000 180,016 123,669  
Asia/Pacific
                        
Segment Information                        
Net sales                 10,843 9,528 9,232  
Sales to Other Segments                 15,721 11,359 9,140  
Income (loss) from operations                 (2,799) (1,471) (111)  
Depreciation and amortization                 1,330 1,211 1,233  
Significant non-cash charges                 194 129 47  
Provision for (benefit from) income taxes                 323 (805) 289  
Capital expenditures and asset acquisitions, net of cash acquired                 916 544 512  
Total Assets 30,455       29,306       30,455 29,306 25,576  
Administrative and all other
                        
Segment Information                        
Lease term of entity's facilities in Vacaville                 10 years      
Net sales                 949 950 319  
Income (loss) from operations                 1,017 (1,118) 1,202  
Depreciation and amortization                 1,466 1,497 1,704  
Significant non-cash charges                 2,051 1,278 607  
Provision for (benefit from) income taxes                 1,099 755 1,798  
Capital expenditures and asset acquisitions, net of cash acquired                   19 368  
Total Assets 82,366       86,683       82,366 86,683 167,702  
Cash and short-term investments 91,900       68,500       91,900 68,500 274,600  
Foreign operating entities
                        
Segment Information                        
Cash and short-term investments $ 83,600               $ 83,600      
Percentage of cash and cash equivalents 47.60%               47.60%