Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2018

Accounts Receivable [Abstract]

Schedule of Accounts Receivable

Accounts receivable consist of the following:

	As of
	March 31, 2018		December 31, 2017
(in thousands)
Receivables from contracts with customers, less doubtful accounts of $22,477 and $22,975	$	499,202	$	600,215
Other receivables	41,391		20,104
	$	540,593	$	620,319