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14. Segment Information Segment Asset Reconciliation (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ 4,273,012 | $ 3,850,504
Operating Segments [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 1,496,200 | 1,294,800
Other Current Assets [Member] | Segment Reconciling Items [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 965,800 | 980,300
Property, Plant and Equipment excluding segment specific [Member] | Segment Reconciling Items [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 57,000 | 91,100
Goodwill [Member] | Segment Reconciling Items [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 506,100 | 477,100
Other Noncurrent Assets [Member] | Segment Reconciling Items [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ 1,247,900 | $ 1,007,200

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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