Acquisitions - Supplemental Pro Forma Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Total income	$ 533,235	$ 511,395	$ 641,214	$ 887,267	$ 187,909	$ 291,980	$ 239,864	$ 103,782	$ 2,573,111	$ 823,535	$ 1,100,952
Total noncontrolling interest	$ 4,900	$ 109	$ 2,713	$ 2,148	$ 42,955	$ 11,489	$ 8,389	$ (782)	9,870	62,051	(20,341)
Net earnings (loss)									932,656	(218,396)	$ 314,411
Morse TEC
Business Acquisition [Line Items]
Total income									76,480	42,766
Total income, pro forma									2,705,013	908,448
Total expenses									(8,918)	(30,187)
Total expenses, pro forma									(1,708,261)	(1,108,141)
Total noncontrolling interest									0	0
Total noncontrolling interest, pro forma									9,870	62,051
Net earnings (loss)									67,562	12,579
Net earnings (loss), pro forma									1,006,622	(137,642)
Pro forma Adjustments
Business Acquisition [Line Items]
Total income									2,629,021	865,682
Total expenses									(1,700,802)	(1,077,954)
Total noncontrolling interest									9,870	62,051
Net earnings (loss)									938,089	$ (150,221)
Revenues Adjustment | Pro forma Adjustments | Morse TEC
Business Acquisition [Line Items]
Total income									(488)
Total expenses									1,459
Total noncontrolling interest									0
Net earnings (loss)									$ 971