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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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Lessee, Operating Lease, Termination Option Term

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Operations and Significant Accounting Policies [Line Items]

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The price per share of the conversion feature embedded in the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Exercise or strike price stated in the contract for options indexed to the issuer's equity shares.

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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.

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