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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Goodwill and Intangible Assets (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)	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	379,863	$ 0	379,863	$ 0
Amortization expense	900	$ 900	1,771	$ 1,771
Remainder of 2019	1,800		1,800
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