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Summary of Significant Accounting Policies (Schedule of Acquired Finite-Lived Intangible Assets by Major Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition cost	$ 98,702	$ 56,495
Accumulated amortization	(23,459)	(17,235)
Intangible Assets, Net (Excluding Goodwill), Total	75,243	39,260
Customer Lists [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition cost	57,672	27,476
Accumulated amortization	(12,695)	(9,138)
Intangible Assets, Net (Excluding Goodwill), Total	44,977	18,338
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition cost	23,546	18,116
Accumulated amortization	(5,646)	(4,558)
Intangible Assets, Net (Excluding Goodwill), Total	17,900	13,558
Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition cost	17,443	10,862
Accumulated amortization	(5,077)	(3,498)
Intangible Assets, Net (Excluding Goodwill), Total	12,366	7,364
Other Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition cost	41	41
Accumulated amortization	(41)	$ (41)
Intangible Assets, Net (Excluding Goodwill), Total

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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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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)
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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
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