Accounts Receivable from Customers (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Accounts Receivable [Line Items]
Accounts receivable from contracts with customers	$ 136,613	$ 184,732
Accrued Income Receivable [Member]
Accounts Receivable [Line Items]
Accounts receivable from contracts with customers	$ 79,300	$ 146,300
Minimum [Member]
Accounts Receivable [Line Items]
Revenue receipt, days after sale	30
Maximum [Member]
Accounts Receivable [Line Items]
Revenue receipt, days after sale	90