Shareholders' Equity (Details) (USD $)	1 Months Ended		9 Months Ended
	Feb. 28, 2011	Mar. 31, 2010	Sep. 30, 2011	Sep. 30, 2010		Dec. 31, 2010
Shareholders' Equity (Textuals)
Number of common shares issued to pension plan		1,190,000
Common stock, par value		$ 1	$ 1	$ 1	[1]	$ 1
Increase in shareholders' equity from issuance of common shares to pension plan		$ 53,864,000
Value of common shares issued to pension plan		1,190,000
Increase in capital in excess of par from issuance of common shares to pension plan		52,674,000
Common stock issued in connection with business acquisitions	372,992
Net of acquired cash, shares	368,527
Shares of common stock issued to trustee under 401(k) savings and retirement plan			110,881	882,131
Net proceeds from issuance of common stock to the trustee under 401(k) savings and retirement plan			$ 4,745,000	$ 41,734,000
Number of shares held in treasury			0	0		0
Shares remaining under the current authorization repurchase program			3,411,416

[1] As Restated, See Note 1