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Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2014
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
2014
2013
Land
$
4,813
$
4,360
Buildings and improvements
3 to 39
16,898
16,082
Construction equipment
2 to 12
269,121
233,051
Office equipment
3 to 8
5,778
5,117
296,610
258,610
Less: Accumulated depreciation and amortization
(147,956
)
(115,679
)
$
148,654
$
142,931