CONSOLIDATED BALANCE SHEETS [Parenthetical] - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Redeemable preferred stock, par value (in dollars per share)	$ 0.60	$ 0.60
Redeemable preferred stock, authorized	200,000	200,000
Redeemable preferred stock, issued	35,225	38,804
Redeemable preferred stock, outstanding	35,225	38,804
Class A common stock [Member]
Common stock, par value (in dollars per share)	$ 0.60	$ 0.60
Common stock, authorized	24,655,000	24,655,000
Common stock, issued	14,871,664	14,781,201
Common stock, outstanding	14,871,664	14,781,201
Class B common stock [Member]
Common stock, par value (in dollars per share)	$ 0.60	$ 0.60
Common stock, authorized	145,000	145,000
Common stock, issued	0	0