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Cost of Contracts, Net (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Cost of Contracts, Net          
Cost of contracts $ 24,433   $ 24,433   $ 24,203
Accumulated amortization (11,129)   (11,129)   (9,917)
Cost of contracts, net 13,304   13,304   14,286
Amortization expense, cost of contracts $ 611 $ 570 $ 1,219 $ 1,137  
Weighted average useful life (in years)     9 years 8 months 12 days 9 years 6 months