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Operations and Significant Accounting Policies (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operations and Significant Accounting Policies [Line Items] |  |  |
Selling and administrative expense | $ 355,617 | $ 351,799 | $ 338,400
Other Noncurrent Assets [Member] |  |  |
Other Assets, Noncurrent [Abstract] |  |  |
Field inventory | 50,400 | 52,400 |
Shipping and Handling [Member] |  |  |
Operations and Significant Accounting Policies [Line Items] |  |  |
Selling and administrative expense | $ 14,000 | $ 13,100 | $ 13,400

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- Definition Operations and Significant Accounting Policies [Line Items] + References No definition available. + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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