Quarterly Financial Data (Unaudited) - Narrative (Details) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2019 USD ($) Reporting_Unit	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) Reporting_Unit
Segment Reporting Information [Line Items]
Asset impairment charges	$ 13,900			$ 49,400	$ 13,892	$ 49,375	$ 58,057
Asset impairment charges, net of tax	$ 10,500			36,500
Net tax charges related to final assessment of the Tax Act				$ 36,000
Number of reporting units | Reporting_Unit	1						2
Termination of the Peru Telecommunications Project
Segment Reporting Information [Line Items]
Charge to earnings related to legal proceedings					$ 79,200
Charge to earnings related to legal proceedings, net of tax		$ 79,200
EPC Electric Transmission Project
Segment Reporting Information [Line Items]
Deferred earnings recognized			$ 60,300
Deferred income recognized, net of tax			$ 43,900
Gain related to the sale of interest in limited partnership	$ 13,000
Gain related to the sale of interest in limited partnership, with associated tax benefits	$ 20,700