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Stock-Based Compensation (Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Stock-Based Compensation [Abstract]
Stock-based compensation expense	$ 21,322	$ 11,660	$ 40,664	$ 24,036
Stock-based compensation expense, net of tax	15,689	8,575	30,091	17,676
Total capitalized stock-based compensation included in net property, plant and equipment on the condensed consolidated balance sheet	155	112	343	391
Excess tax benefit (deficit) on stock-based compensation recognized in provision for income taxes	$ 5,264	$ (431)	$ 10,698	$ (5,973)

X

- Definition

Excess tax benefit or deficiency recorded to the provision for income taxes in the consolidated statement of income, instead of additional paid-in capital in the consolidated statement of income. Additionally, excess tax benefits will be classified as operating activities in in the consolidated statement of cash flow.

+ References

No definition available.

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- Definition

Amount, after tax, of expense for award under share-based payment arrangement.

+ References

No definition available.

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- Definition

Amount of cost capitalized for award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- References

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- Definition

Amount of cost expensed and capitalized for award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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