Condensed Consolidated Balance Sheets Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 6,697	$ 6,837
Common, stated value per share	$ 20	$ 20
Authorized	50,000,000	50,000,000
Issued to voting trustees	13,710,417	13,164,362
Issued to shareholders	2,822,819	2,765,577
In treasury, at cost	(702,161)	(41,576)
Outstanding common stock	15,831,075	15,888,363