Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2015

Accounts Receivable, Net [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

Accounts receivable consisted of the following as of March 31, 2015 and December 31, 2014 (dollars in thousands):

	March 31, 2015			December 31, 2014
Accounts receivable - trade	$	358,580		$	304,087
Accounts receivable - grants from outside parties	20,271			32,076
Accounts receivable - insurance and other third-party claims	22,576			26,941
Total accounts receivable	401,427			363,104
Less: Allowance for doubtful accounts	(7,295		)	(5,826		)
Accounts receivable, net	$	394,132		$	357,278