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Goodwill (Changes in Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Impaired, Period In Which Two-Step Goodwill Impairment Is Performed	3 years
Goodwill [Roll Forward]
Goodwill at the beginning of year	$ 287,956	$ 275,487
Increase in goodwill related to acquisitions	16,777	12,469
Decrease in goodwill related to impairments	(846)	0
Goodwill at the end of the year	$ 303,887	$ 287,956
Goodwill, Qualitative Impairment Assessment, Period	2 years

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- Definition

Goodwill, Impaired, Period In Which Two-Step Goodwill Impairment Is Performed

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Goodwill, Qualitative Impairment Assessment, Period

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Goodwill, Written Off Due To Discontinued Operations

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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-Topic 350
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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