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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
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