Accounts Receivable (Tables)

6 Months Ended

Jun. 30, 2016

Accounts Receivable, Net [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable

Accounts receivable consisted of the following as of June 30, 2016 and December 31, 2015 (dollars in thousands):

	June 30, 2016			December 31, 2015
Accounts receivable –trade	$	353,503		$	339,100
Accounts receivable – grants from outside parties	12,475			22,997
Accounts receivable – insurance and other third-party claims	19,516			26,574
Total accounts receivable	385,494			388,671
Less: Allowance for doubtful accounts	(16,790		)	(6,213		)
Accounts receivable, net	$	368,704		$	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 and six months ended June 30, 2016 and 2015 (dollars in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2016		2015		2016		2015
Amortization of deferred grants	$	2,912	$	2,725	$	5,861	$	5,524