Condensed Consolidated Balance Sheets Parenthetical (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Allowance for doubtful accounts	$ 7,345	$ 7,764
Common, stated value per share	$ 20	$ 20
Authorized	20,000,000	20,000,000
Issued to voting trustees	10,849,553	10,611,982
Issued to shareholders	2,310,184	2,285,255
In treasury, at cost	(92,831)	(15,725)
Outstanding Common Stock	13,066,906	12,881,512