Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accrued Liabilities [Abstract]
Accrued salaries and benefits	$ 7,527	$ 8,444
Accrued incentive compensation	3,497	4,210
Accrued value added tax	960	1,064
Other Accrued Liabilities, Current	3,567	4,092
Accrued liabilities	$ 15,551	$ 17,810