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Goodwill and Other Intangibles (Changes in Net Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Goodwill and Other Intangibles |  |
Goodwill, beginning balance | $ 807,260 | $ 789,058
Change in goodwill related to small acquisitions | 1,464 | 18,202
Provisional goodwill and intangibles related to Mayasa acquisition | 128,090 | 0
Goodwill, ending balance | 936,814 | $ 807,260
Mayasa |  |
Goodwill and Other Intangibles |  |
Provisional goodwill and intangibles related to Mayasa acquisition | $ 128,100 |

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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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