Accounts Receivable

6 Months Ended

Jun. 30, 2018

Accounts and Notes Receivable, Net [Abstract]

Accounts Receivable

ACCOUNTS RECEIVABLE

Accounts receivable consist of the following:

	As of
	June 30, 2018		December 31, 2017
(in thousands)
Receivables from contracts with customers, less doubtful accounts of $17,019 and $22,975	$	476,658	$	600,215
Other receivables	86,922		20,104
	$	563,580	$	620,319

Bad debt expense was $0.3 million and $6.4 million for the three months ended June 30, 2018 and 2017, respectively; and $6.1 million and $12.2 million for the six months ended June 30, 2018 and 2017, respectively.