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Property and Equipment | 12 Months Ended
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Dec. 31, 2017
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 |  | 2017 |  | 2016
Land |  |  | — |  |  | $ | 7,733 |  |  | $ | 5,468 |
Buildings and improvements |  |  | 3 to 39 |  |  |  | 22,718 |  |  |  | 21,660 |
Construction equipment |  |  | 3 to 12 |  |  |  | 340,060 |  |  |  | 329,299 |
Office equipment |  |  | 3 to 10 |  |  |  | 8,964 |  |  |  | 7,930 |
|  |  |  |  |  |  | 379,475 |  |  |  | 364,357 |
Less: Accumulated depreciation and amortization |  |  |  |  |  |  | (231,391 | ) |  |  | (209,466 | )
|  |  |  |  |  | $ | 148,084 |  |  | $ | 154,891 |
Construction equipment includes assets under capital leases — see additional information provided in Note 12 — Lease Obligations to the Financial Statements. Depreciation and amortization expense of property and equipment for the years ended December 31, 2017, 2016 and 2015 was $38.1 million, $38.2 million and $37.5 million, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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