Property and Equipment

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment Disclosure [Text Block]

6. Property and Equipment

Property and equipment consisted of the following at December 31:

(dollars in thousands)	Estimated Useful Life in Years		2015			2014
Land		—	$	5,782		$	4,813
Buildings and improvements		3 to 39		21,401			16,898
Construction equipment		3 to 12		308,628			269,121
Office equipment		3 to 10		6,442			5,778
				342,253			296,610
Less: Accumulated depreciation and amortization				(181,575	)		(147,956	)
			$	160,678		$	148,654

Depreciation and amortization expense of property and equipment for the years ended December 31, 2015, 2014 and 2013 was $37.5 million, $33.1 million and $28.9 million, respectively.