Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Unaudited) (Details Textual)

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Quarterly Financial Data (Unaudited) (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly Financial Data (Textual) [Abstract]                      
Amount of increase in income from operations $ 305                    
Restructuring and transaction related costs 506 215 1,353 644 689 302 53 10 115 434 961
Additional income taxes recorded 848                    
Additional income taxes amount to adjust deferred tax assets $ 392