Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Consolidated Balance Sheets [Abstract]
Allowances for contract receivables	$ 1,693	$ 811
Allowances for employee advances and miscellaneous receivables	538	272
Accumulated amortization on intangible assets	$ 27,720	$ 22,116
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	27,893,132	25,108,754
Common stock, shares outstanding	27,893,132	25,108,754