Accounts Payable and Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2013

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,
	2013		2012
Trade accounts payable	$	11,815	$	11,061
Accrued salaries, vacation and benefits		15,731		16,463
Other accrued expenses		20,127		17,393
Accrued contingent consideration		2,405		2,540
Negative cash book balance		5,261		—
	$	55,339	$	47,457