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Goodwill (Details 2) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2011
Federal division
Dec. 31, 2011
IT outsourcing division
Jun. 30, 2013
International
Jun. 30, 2013
North America
Jun. 30, 2013
Weighted Average Cost of Capital
International
Jun. 30, 2013
Weighted Average Cost of Capital
North America
Goodwill [Line Items]                    
Discrete forecast period 5 years                  
Annual average revenue growth rate 4.00%                  
Projected growth rates after discrete forecast period 3.00%                  
Weighted average cost of capital                 13.00% 14.50%
Enterprise value/revenue multiples             0.3 0.35    
Enterprise value/EBITDA multiples             5.5 5    
Control premium 35.00%                  
Percentage of excess of fair value of goodwill over carrying value             16.00% 19.00%    
Goodwill impairment   $ 0 $ 0 $ 16,300 $ 27,400 $ 16,300