The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Goodwill and Intangible Assets (Narrative) (Details) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) segment	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) segment
Goodwill [Line Items]
Number of reportable segments \| segment				3		3
Goodwill	$ 205,143			$ 205,143		$ 585,006
Goodwill, Impairment Loss	0	$ 379,863	$ 0	379,863	$ 0
Amortization expense	900		$ 900	2,657	$ 2,657
Remainder of 2019	900			900
2020	3,500			3,500
2021	3,400			3,400
2022	2,600			2,600
2023	2,500			2,500
2024	2,500			2,500
Specialty Contractors [Member]
Goodwill [Line Items]
Goodwill	0			0		156,193
Goodwill, Impairment Loss		156,193
Civil [Member]
Goodwill [Line Items]
Goodwill	205,143			205,143		415,358
Goodwill, Impairment Loss		210,215
Building [Member]
Goodwill [Line Items]
Goodwill	$ 0			$ 0		$ 13,455
Goodwill, Impairment Loss		$ 13,455