Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2016

Accounts Receivable, Net [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable

Accounts receivable consisted of the following as of March 31, 2016 and December 31, 2015 (dollars in thousands):

	March 31, 2016			December 31, 2015
Accounts receivable - trade	$	340,331		$	339,100
Accounts receivable - grants from outside parties	13,687			22,997
Accounts receivable - insurance and other third-party claims	25,074			26,574
Total accounts receivable	379,092			388,671
Less: Allowance for doubtful accounts	(16,659		)	(6,213		)
Accounts receivable, net	$	362,433		$	382,458

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, 2016 and 2015 (dollars in thousands):

	Three Months Ended
	March 31,
	2016		2015
Amortization of deferred grants	$	2,949	$	2,799