Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	$ 13,699	$ 13,965
Finite-Lived Intangible Assets, Accumulated Amortization	(7,184)	(6,208)
Intangible Assets, Net (Excluding Goodwill)	6,515	7,757
Amortization of Intangible Assets	1,200	1,200	$ 1,300
Finite-Lived Intangible Assets, Gross [Abstract]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	1,087
Finite-Lived Intangible Assets, Amortization Expense, Year Two	1,087
Finite-Lived Intangible Assets, Amortization Expense, Year Three	1,087
Finite-Lived Intangible Assets, Amortization Expense, Year Four	792
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 639
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	35 years
Customer-Related Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	$ 7,172	7,551
Finite-Lived Intangible Assets, Accumulated Amortization	(4,234)	(3,921)
Intangible Assets, Net (Excluding Goodwill)	$ 2,938	3,630
Finite-Lived Intangible Asset, Useful Life	5 years 6 months 11 days
Use Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	$ 6,527	6,414
Finite-Lived Intangible Assets, Accumulated Amortization	(2,950)	(2,287)
Intangible Assets, Net (Excluding Goodwill)	$ 3,577	$ 4,127
Finite-Lived Intangible Asset, Useful Life	4 years 10 months 21 days