Intangible Assets (Schedule of Company's Intangible Assets) (Details) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Unamortized intangible assets:
Goodwill, Gross Carrying Amount	[1]	$ 12,796	$ 11,817
Goodwill, Accumulated Amortization	[1]	(227)	(227)
Total intangible assets		18,222	16,817
Accumulated Amortization		(3,436)	(3,230)
Customer Lists [Member]
Assets eligible for amortization:
Gross Carrying Amount		4,288	3,933
Accumulated Amortization		(2,517)	(2,342)
Patents [Member]
Assets eligible for amortization:
Gross Carrying Amount		72	72
Accumulated Amortization		(10)	(8)
Non-compete Agreements [Member]
Assets eligible for amortization:
Gross Carrying Amount		332	261
Accumulated Amortization		(273)	(261)
Software [Member]
Assets eligible for amortization:
Gross Carrying Amount		234	234
Accumulated Amortization		(234)	(234)
Other [Member]
Assets eligible for amortization:
Gross Carrying Amount		500	500
Accumulated Amortization		$ (175)	$ (158)

[1] 1 Amortization through December 31, 2001 prior to adoption of FASB ASC 350.