Condensed Consolidated Balance Sheets Parenthetical (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts	$ 6,980	$ 6,837
Common, stated value per share	$ 20.00	$ 20.00
Authorized	50,000,000	50,000,000
Issued to voting trustees	13,464,170	13,164,362
Issued to shareholders	2,796,095	2,765,577
In treasury, at cost	(316,819)	(41,576)
Outstanding Common Stock	15,943,446	15,888,363