Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 3.5	$ 3.8
Current maturities and loan origination fees	0.5	0.6
Premium on notes payable	2.5	3.0
Debt issuance costs on notes payable	$ 7.8	$ 9.3
Preferred stock, no par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized	300,000	300,000
Preferred stock, shares issued	0	0
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	16,500,000	16,600,000