Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Allowances for contract receivables	$ 2,491	$ 1,693
Allowances for employee advances and miscellaneous receivables	335	538
Accumulated amortization on intangible assets	$ 29,754	$ 27,720
Common stock, par value (usd per share)	$ 0	$ 0
Common stock, stated value per share (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	50,000,000	50,000,000
Common stock, shares issued (shares)	29,198,977	27,893,132
Common stock, shares outstanding (shares)	29,198,977	27,893,132