Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Allowances for contract receivables	$ 1,092	$ 930
Allowance for employee advances and misc receivables	601	681
Accumulated amortization on intangible assets	$ 35,646	$ 35,708
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)	21,831,025	22,681,656
Common stock, shares outstanding (shares)	21,831,025	22,681,656