Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Condensed Consolidated Balance Sheets [Abstract]
Allowances for contract receivables	$ 2,618	$ 1,693
Allowances for employee advances and miscellaneous receivables	387	538
Accumulated amortization on intangible assets	$ 28,552	$ 27,720
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	28,850,338	27,893,132
Common stock, shares outstanding	28,850,338	27,893,132