CONDENSED CONSOLIDATED BALANCE SHEETS [Parenthetical] - $ / shares	Jun. 30, 2017	Dec. 31, 2016
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	45,087	35,225
Redeemable preferred stock, outstanding	45,087	35,225
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	14,889,865	14,871,664
Common stock, outstanding	14,889,865	14,871,664
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