Condensed Consolidated Balance Sheets Parenthetical (USD $) In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Allowance for doubtful accounts	$ 7,277	$ 7,764
Common, stated value per share	$ 20.00	$ 20.00
Authorized	20,000,000	20,000,000
Issued to voting trustees	11,064,972	10,611,982
Issued to shareholders	2,337,551	2,285,255
In treasury, at cost	(421,674)	(15,725)
Outstanding Common Stock	12,980,849	12,881,512