Accounts Receivable (Tables)

9 Months Ended

Sep. 30, 2018

Accounts and Notes Receivable, Net [Abstract]

Schedule of Accounts Receivable

Accounts receivable consist of the following:

	As of
	September 30, 2018		December 31, 2017
(in thousands)
Receivables from contracts with customers, less doubtful accounts of $14,453 and $22,975	$	544,487	$	600,215
Other receivables	45,158		20,104
	$	589,645	$	620,319