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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, 2016 | Dec. 31, 2015
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition cost | $ 56,495 | $ 47,232
Accumulated amortization | (17,235) | (11,514)
Intangible Assets, Net (Excluding Goodwill), Total | 39,260 | 35,718
Customer Lists [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition cost | 27,476 | 23,003
Accumulated amortization | (9,138) | (6,101)
Intangible Assets, Net (Excluding Goodwill), Total | 18,338 | 16,902
Trade Names [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition cost | 18,116 | 15,129
Accumulated amortization | (4,558) | (3,043)
Intangible Assets, Net (Excluding Goodwill), Total | 13,558 | 12,086
Technology [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition cost | 10,862 | 9,066
Accumulated amortization | (3,498) | (2,336)
Intangible Assets, Net (Excluding Goodwill), Total | 7,364 | 6,730
Other Intangible Assets [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition cost | 41 | 34
Accumulated amortization | (41) | $ (34)
Intangible Assets, Net (Excluding Goodwill), Total |  |

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