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Shareholders' Equity (Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Stockholders' Equity Note [Abstract]
Stock-based compensation expense	$ 5,453	$ 5,878	$ 15,555	$ 16,396
Less: Deferred tax benefit	(1,042)	(1,311)	(2,959)	(3,556)
Stock-based compensation expense, net of tax	$ 4,411	$ 4,567	$ 12,596	$ 12,840

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

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-SubTopic 10
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-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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-SubTopic 10
-Section 50
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Amount, after tax, of expense for award under share-based payment arrangement.

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+ References

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-SubTopic 10
-Section 50
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