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Joint Ventures (Details) (USD $)
12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2006
CTQ Engineering LLC
firm
Dec. 31, 2013
CTQ Engineering LLC
Dec. 31, 2013
Subsidiaries
Dec. 31, 2012
Subsidiaries
Dec. 31, 2011
Subsidiaries
Schedule of Equity Method Investments [Line Items]                
Percentage of ownership in investment         50.00% 67.00%    
Aggregate cost of investment           $ 600,000    
Income before income taxes $ 20,648,000 $ 32,015,000 $ 20,130,000     $ 600,000 $ 1,200,000 $ 700,000
Number of firms that make up LLC       2