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Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Feb. 08, 2018 | Dec. 31, 2017 | May 31, 2017
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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |
Goodwill | $ 1,554,830 |  | $ 1,478,257 |
Snell Advanced Media |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |
Receivables |  | $ 17,182 |  |
Inventory |  | 15,312 |  |
Prepaid and other current assets |  | 3,375 |  |
Property, plant, and equipment |  | 7,789 |  |
Intangible assets |  | 54,100 |  |
Goodwill |  | 87,853 |  |
Deferred taxes |  | 5,476 |  |
Other long-lived assets |  | 2,156 |  |
Total assets acquired |  | 193,243 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |
Accounts payable |  | 11,927 |  |
Accrued liabilities |  | 21,614 |  |
Deferred revenue |  | 3,924 |  |
Long-term debt |  | 19,315 |  |
Postretirement benefits |  | 31,343 |  |
Other long-term liabilities |  | 591 |  |
Total liabilities assumed |  | 88,714 |  |
Net assets |  | $ 104,529 |  |
Thinklogical Holdings LLC |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |
Receivables |  |  |  | $ 4,355
Inventory |  |  |  | 16,424
Prepaid and other current assets |  |  |  | 320
Property, plant, and equipment |  |  |  | 4,289
Intangible assets |  |  |  | 73,400
Goodwill |  |  |  | 70,654
Deferred income taxes |  |  |  | 598
Total assets acquired |  |  |  | 170,040
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |
Accounts payable |  |  |  | 1,231
Accrued liabilities |  |  |  | 1,353
Deferred revenue |  |  |  | 1,702
Total liabilities assumed |  |  |  | 4,286
Net assets |  |  |  | $ 165,754

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- Definition Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of deferred revenue expected to be recognized as such within one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax asset attributable to deductible temporary differences and carryforwards acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31917-109318 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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