Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accounts receivable, net of allowances of $17,327 in 2014 and $13,705 in 2013	$ 17,327	$ 13,705
Shares Outstanding Class A
Common stock, par value	$ 1	$ 1
Common stock, shares outstanding	5,662,214	6,290,414
Shares Outstanding Class B
Common stock, par value	$ 1	$ 1
Common stock, shares outstanding	1,573,292	1,581,106
Common stock, convertible conversion ratio	1	1