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Revenue Recognition (Disaggregation of Revenue by Principal Geographic Area, Based on Customers' Domiciles) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 2,706,655 | $ 2,406,908 | $ 2,213,242
Americas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 1,850,485 | 1,651,581 | 1,503,084
United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 1,691,224 | 1,495,516 | 1,357,909
Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 107,398 | 99,550 | 94,206
Latin America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 51,863 | 56,515 | 50,969
Europe, the Middle East and Africa |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 562,765 | 498,439 | 472,070
Germany |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 119,353 | 104,081 | 100,459
United Kingdom |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 90,156 | 90,969 | 87,807
France |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 74,814 | 64,767 | 60,319
Italy |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 42,817 | 39,725 | 36,956
Spain |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 39,265 | 36,439 | 33,687
Switzerland |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 24,850 | 20,855 | 19,875
Netherlands |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 23,461 | 19,397 | 18,090
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 148,049 | 122,206 | 114,877
Asia Pacific Region |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 293,405 | 256,888 | 238,088
Australia |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 79,629 | 71,069 | 63,386
Japan |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 74,725 | 67,246 | 60,213
China |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 70,845 | 57,518 | 57,621
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 68,206 | $ 61,055 | $ 56,868

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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