Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Consolidated Balance Sheets [Abstract]
Allowances for contract receivables	$ 811	$ 591
Allowances for employee advances and miscellaneous receivables	272	669
Accumulated amortization of intangible assets	$ 22,115	$ 17,574
Common stock, par value
Common stock, stated value per share	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	25,108,754	23,932,774
Common stock, shares outstanding	25,108,754	23,932,774