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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% |  |  |

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