Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Allowances for contract receivables	$ 930	$ 2,243
Allowances for employee advances and miscellaneous receivables	681	692
Accumulated amortization on intangible assets	$ 35,708	$ 33,973
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)	22,681,656	26,762,861
Common stock, shares outstanding (shares)	22,681,656	26,762,861