Accounts Receivable (Tables)

6 Months Ended

Jun. 30, 2014

Accounts Receivable, Net [Abstract]

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

Accounts receivable consisted of the following as of June 30, 2014 and December 31, 2013 (dollars in thousands):

	June 30, 2014			December 31, 2013
Accounts receivable - trade	$	294,717		$	264,562
Accounts receivable - grants from outside parties	25,928			33,003
Accounts receivable - insurance and other third-party claims	36,473			31,643
Total accounts receivable	357,118			329,208
Less: Allowance for doubtful accounts	(4,835		)	(3,755		)
Accounts receivable, net	$	352,283		$	325,453