Revenue (Breakdown of Revenues by Accounting Standards) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contract with customers	$ 1,527,141	$ 1,391,848	$ 898,885
Total revenues	8,208,436	8,170,191	3,045,382
Revenues under ASC 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contract with customers	1,527,141	1,391,848	898,885
Revenues under ASC 842
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	96,386	118,411	105,631
Revenues under ASC 815
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 6,584,909	$ 6,659,932	$ 2,040,866