Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Allowance for doubtful accounts	$ 2,235	$ 2,751
Common stock, shares authorized	1,200,000
Common Class A
Common stock, par or stated value per share	$ 1.00	$ 1.00
Common stock, shares authorized	600,000	600,000
Common stock, shares, outstanding	194,852	188,938
Common Class B
Common stock, par or stated value per share	$ 1.00
Common stock, shares authorized	600,000
Common stock value convertible stated value per share	$ 1.00	$ 1.00
Common stock value convertible, authorized	600,000	600,000
Common stock value convertible, outstanding	0	0