Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Allowances for contract receivables	$ 2,089	$ 1,996
Allowances for employee advances and miscellaneous receivables	549	402
Accumulated amortization on intangible assets	$ 35,231	$ 32,717
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)	27,256,096	29,367,439
Common stock, shares outstanding (shares)	27,256,096	29,367,439