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Acquisition and Investments (Narrative) (Details) (USD $)
12 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Sep. 29, 2012
Acquisition of Tenco Group Inc
Oct. 20, 2011
Acquisition of Tenco Group Inc
Sep. 30, 2012
Acquisition of Tenco Group Inc
Dec. 31, 2011
Acquisition of Tenco Group Inc
Oct. 17, 2011
Acquisition of Tenco Group Inc
Sep. 30, 2012
Acquisition of Tenco Group Inc
Dec. 31, 2012
Acquisition of Tenco Group Inc
Oct. 18, 2011
Acquisition of Tenco Group Inc
Business Acquisition [Line Items]                      
Less: Purchase Price           $ 5,933,000     $ 5,933,000   $ 5,933,000
Fair value of net assets acquired           14,549,000     14,549,000   13,678,000
Gain on Bargain purchase 0 8,616,000 0 8,616,000 7,745,000   8,600,000 7,745,000      
Purchase accounting adjustments       871,000         871,000    
Acquisition related costs             600,000        
Revenue generated by Tenco 628,402,000 603,593,000 538,548,000     7,000,000       28,400,000  
Net income of Tenco           $ 200,000       $ 800,000