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Cost of Contracts, Net (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Cost of Contracts, Net          
Cost of contracts $ 24,768   $ 24,768   $ 24,203
Accumulated amortization (11,738)   (11,738)   (9,917)
Cost of contracts, net 13,030   13,030   14,286
Amortization expense, cost of contracts $ 609 $ 555 $ 1,828 $ 1,691  
Weighted average useful life     9 years 8 months 12 days 9 years 6 months