Accounts Receivable (Tables)

9 Months Ended

Sep. 30, 2018

Schedule of Accounts, Notes, Loans and Financing Receivable

Accounts receivable consisted of the following as of September 30, 2018 and December 31, 2017 (dollars in thousands):



	September 30, 2018			December 31, 2017
Accounts receivable – trade	$	423,880		$	401,723
Accounts receivable – grants from outside parties	14,610			17,734
Accounts receivable – insurance and other third-party claims	12,186			10,753
Total accounts receivable	450,676			430,210
Less: Allowance for doubtful accounts	(9,571		)	(13,505		)
Accounts receivable, net	$	441,105		$	416,705

Grant amortization offset to depreciation expense

The following table sets forth the offset to depreciation expense from the amortization of deferred grants recorded by the Company during the three and nine months ended September 30, 2018 and 2017 (dollars in thousands):



	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Amortization of deferred grants	$	3,173	$	2,978	$	8,776	$	9,287