Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

Property and equipment consisted of the following at December 31:

(dollars in thousands)	Estimated Useful Life in Years		2016			2015
Land		—	$	5,468		$	5,782
Buildings and improvements		3 to 39		21,660			21,401
Construction equipment		3 to 12		329,299			308,628
Office equipment		3 to 10		7,930			6,442
				364,357			342,253
Less: Accumulated depreciation and amortization				(209,466	)		(181,575	)
			$	154,891		$	160,678