Goodwill and Other Intangibles (Schedule of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 30, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Carrying value, beginning balance	$ 37,279	$ 37,133		$ 34,395
Business Acquisition, Goodwill, Expected Tax Deductible Amount			$ 2,738
Purchase Price Adjustment to Goodwill	146
Carrying value, ending balance	37,279
CAM [Member]
Goodwill [Roll Forward]
Carrying value, beginning balance	34,395	34,395		$ 34,395
Carrying value, ending balance	34,395
Pemco [Member]
Goodwill [Roll Forward]
Carrying value, beginning balance	2,884	$ 2,738
Business Acquisition, Goodwill, Expected Tax Deductible Amount			$ 2,738
Purchase Price Adjustment to Goodwill	146
Carrying value, ending balance	$ 2,884