Acquisitions - Summary of Pro Forma Adjustments (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
Pro forma Adjustments
Business Acquisition [Line Items]
Total income									2,629,021	865,682
Total expenses									1,700,802	1,077,954
Morse TEC
Business Acquisition [Line Items]
Total income									76,480	42,766
Total expenses									8,918	$ 30,187
Morse TEC | Pro forma Adjustments | Revenues Adjustment
Business Acquisition [Line Items]
Total income									(488)
Total expenses									$ (1,459)