Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
Allowances for contract receivables	$ 1,123	$ 811
Allowances for employee advances and miscellaneous receivables	499	272
Accumulated amortization on intangible assets	$ 26,338	$ 22,115
Common stock, par value	$ 0	$ 0
Common stock, stated value per share	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	25,386,551	25,108,754
Common stock, shares outstanding	25,386,551	25,108,754