Condensed Consolidated Balance Sheets Parenthetical (USD $) In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Allowance for doubtful accounts	$ 7,379	$ 7,764
Common, stated value per share	$ 20.00	$ 20.00
Authorized	20,000,000	20,000,000
Issued to voting trustees	10,951,924	10,611,982
Issued to shareholders	2,323,052	2,285,255
In treasury, at cost	(252,515)	(15,725)
Outstanding Common Stock	13,022,461	12,881,512