Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2019

Accounts Receivable, Net [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable

Accounts receivable consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31, 2019			December 31, 2018
Accounts receivable – trade	$	399,157		$	397,255
Accounts receivable – grants from outside parties	17,263			19,376
Accounts receivable – insurance and other third-party claims	33,575			19,729
Total accounts receivable	449,995			436,360
Less: Allowance for doubtful accounts	(10,468		)	(10,055		)
Accounts receivable, net	$	439,527		$	426,305

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 months ended March 31, 2019 and 2018, (dollars in thousands):

	Three Months Ended
	March 31,
	2019		2018
Amortization of deferred grants	$	3,508	$	2,467