Accounts Payable and Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2012

Payables and Accruals [Abstract]

Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]

Accounts payable and accrued expenses consisted of the following (in thousands):

	December 31,
	2012		2011
Trade accounts payable	$	11,061	$	10,481
Accrued salaries, vacation and benefits		16,463		14,517
Other accrued expenses		17,393		13,075
Accrued contingent consideration		2,540		2,539
Negative cash book balance		—		1,888
	$	47,457	$	42,500