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Summary of Significant Accounting Policies (Other Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition cost	$ 88,470	$ 98,702
Accumulated amortization	(26,438)	(23,459)
Intangible Assets, Net (Excluding Goodwill), Total	62,032	75,243
Customer Lists [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition cost	52,200	57,672
Accumulated amortization	(14,549)	(12,695)
Intangible Assets, Net (Excluding Goodwill), Total	37,651	44,977
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition cost	20,689	23,546
Accumulated amortization	(5,884)	(5,646)
Intangible Assets, Net (Excluding Goodwill), Total	14,805	17,900
Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition cost	15,581	17,443
Accumulated amortization	(6,005)	(5,077)
Intangible Assets, Net (Excluding Goodwill), Total	$ 9,576	12,366
Other Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition cost		41
Accumulated amortization		$ (41)

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

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