Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2011

ACCOUNTS RECEIVABLE: [Abstract]

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

Accounts receivable consisted of the following at December 31, 2011 and 2010 (dollars in thousands):

	2011			2010
Accounts receivable—trade	$	147,822		$	118,265
Accounts receivable—grants	20,753			17,039
Total accounts receivable	168,575			135,304
Less: allowance for doubtful accounts	(2,807		)	(3,079		)
Accounts receivable, net	$	165,768		$	132,225

Allowance for doubtful accounts [Table Text Block]

Activity in the Company’s allowance for doubtful accounts for the years ended December 31, 2011, 2010 and 2009 was as follows (dollars in thousands):

	2011			2010			2009
Balance, beginning of year	$	3,079		$	3,764		$	2,907
Provisions	1,055			1,799			2,250
Charges	(1,327		)	(2,484		)	(1,393		)
Balance, end of year	$	2,807		$	3,079		$	3,764