Stock Based Compensation (Details) (USD $)	3 Months Ended				6 Months Ended				3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012 Stock Awards [Member]	Jun. 30, 2012 Stock Awards [Member]	Jun. 30, 2012 Restricted Stock Units (RSUs) [Member]	Jun. 30, 2012 Restricted Stock Units (RSUs) [Member]	Mar. 31, 2012 Unrestricted stock [Member]	Jun. 30, 2012 Time Based Restricted Stock Units [Member]	Jun. 30, 2012 Time Based Restricted Stock Units [Member] Executive Officer [Member]	Jun. 30, 2012 Absolute Performance Based Restricted Stock Units [Member]	Jun. 30, 2012 Absolute Performance Based Restricted Stock Units [Member] Executive Officer [Member]	Jun. 30, 2012 Relative Performance Based Restricted Stock Units [Member]	Jun. 30, 2012 Relative Performance Based Restricted Stock Units [Member] Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares received by independent Directors (in shares)											65,500		5,712
Common stock, par value (in dollars per share)											$ 1.00	$ 1.00
Number of key individuals	10				10
Shares available for grant on attainment of performance targets (in shares)											81,875	81,875
Share-based Compensation [Abstract]
Share-based Compensation Expense	$ 214,000		$ 428,000		$ 544,000		$ 1,006,000
Related Reduction in Earnings Per Share	$ (0.03)	[1]	$ (0.06)	[1]	$ (0.08)	[1]	$ (0.15)	[1]
Share-based Compensation Expense [Abstract]
Allocated share-based compensation expense									$ 30,000	$ 360,000	$ 184,000	$ 184,000
Reduction of basic and diluted earnings per share due to stock-based compensation charges (in dollars per share)										$ 0.05	$ 0.03	$ 0.03
Shares [Roll Forward]
Non-vested - Beginning of Period (in shares)										87,500		0
Shares/Stock Units Granted (in shares)										5,712		65,500
Shares Vested (in shares)										(93,212)		0
Non-vested - End of Period (in shares)									0	0	65,500	65,500
Weighted Average Fair Value Per Share [Roll Forward]
Non-vested - Beginning of Period (in dollars per share)										$ 22.91		$ 0
Shares/Stock units Granted (in dollars per share)										$ 21.01		$ 21.48
Shares Vested (in dollars per share)										$ 22.79		$ 0
Non-vested - End of Period (in dollars per share)									$ 0	$ 0	$ 21.48	$ 21.48
Number of top executives											2	2
Maximum shares allocated to each share based compensation unit														1		1.5		1.5
Vesting period														3 years	1 year	3 years	1 year	3 years	1 year

[1] Same for basic and diluted earnings per share