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Operations and Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operations and Significant Accounting Policies [Line Items] |  |  |
Selling and administrative expense | $ 400,141 | $ 355,617 | $ 351,799
Other Noncurrent Assets |  |  |
Other Assets, Noncurrent [Abstract] |  |  |
Field inventory | 50,300 | 50,400 |
Shipping and Handling [Member] |  |  |
Operations and Significant Accounting Policies [Line Items] |  |  |
Selling and administrative expense | $ 15,400 | $ 14,000 | $ 13,100
Minimum [Member] |  |  |
Operations and Significant Accounting Policies [Line Items] |  |  |
Remaining Lease Term | 1 year |  |
Lessee, Operating Lease, Termination Option Term | 1 year |  |
Maximum [Member] |  |  |
Operations and Significant Accounting Policies [Line Items] |  |  |
Remaining Lease Term | 11 years |  |
Lessee, Operating Lease, Renewal Term | 5 years |  |
2.625 Percent Convertible Notes Due 2024 [Member] | Convertible Notes Payable [Member] |  |  |
Operations and Significant Accounting Policies [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.625% |  |
Debt Instrument, Convertible, Conversion Price | $ 88.80 |  |
Option Indexed to Issuer's Equity, Strike Price | $ 114.92 |  |

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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + 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=116634182&loc=SL114868664-224227 + Details
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