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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
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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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