Accounts Receivable (Tables)

6 Months Ended

Jun. 30, 2017

Accounts Receivable, Net [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable

Accounts receivable consisted of the following as of June 30, 2017 and December 31, 2016, (dollars in thousands):

	June 30, 2017			December 31, 2016
Accounts receivable – trade	$	371,990		$	353,347
Accounts receivable – grants from outside parties	9,981			10,652
Accounts receivable – insurance and other third-party claims	10,837			11,994
Total accounts receivable	392,808			375,993
Less: Allowance for doubtful accounts	(12,869		)	(12,070		)
Accounts receivable, net	$	379,939		$	363,923

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 June 30, 2017 and 2016 (dollars in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
Amortization of deferred grants	$	3,065	$	2,912	$	6,310	$	5,861