Stock Based Compensation (Details) (USD $)	3 Months Ended					3 Months Ended					3 Months Ended							3 Months Ended			3 Months Ended
	Mar. 31, 2013 Individual		Mar. 31, 2012		Mar. 11, 2013	Mar. 31, 2013 Stock Awards [Member]	Mar. 31, 2013 Stock Awards [Member] Independent Directors [Member]	Mar. 31, 2012 Stock Awards [Member] Independent Directors [Member]	Mar. 31, 2013 Restricted Stock Units (RSUs) [Member] Executive	Dec. 31, 2012 Restricted Stock Units (RSUs) [Member]	Mar. 31, 2013 Restricted Stock Units (RSUs) [Member] Executive Officer [Member]	Mar. 31, 2012 Restricted Stock Units (RSUs) [Member] Executive Officer [Member]	Mar. 31, 2013 Time Based Restricted Stock Units [Member]	Mar. 31, 2013 Time Based Restricted Stock Units [Member] Top Executives [Member]	Mar. 31, 2013 Absolute Performance Based Restricted Stock Units [Member]		Apr. 23, 2013 Absolute Performance Based Restricted Stock Units [Member]	Mar. 31, 2013 Relative Performance Based Restricted Stock Units [Member]		Apr. 23, 2013 Relative Performance Based Restricted Stock Units [Member]	Mar. 31, 2013 Relative Performance Based Restricted Stock Units [Member] Top Executives [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par value (in dollars per share)	$ 1.00								$ 1
Number of key individuals	10
Shares available for grant on attainment of performance targets (in shares)									81,875
Share-based Compensation [Abstract]
Share-based Compensation Expense	$ 273,000		$ 340,000				$ 30,000	$ 340,000			$ 243,000	$ 0
Related Reduction in Earnings Per Share (in dollars per share)	$ (0.03)	[1]	$ (0.05)	[1]
Additional shares vested due to accelerated vesting																	3,376			1,788
Shares [Roll Forward]
Non-vested - Beginning of Period (in shares)						0			42,014	65,500
Unrestricted Shares Granted (in shares)						6,708									8,188	[2]
Shares Vested (in shares)						(6,708)									(18,188)			(5,300)
Shares Forfeited (in shares)						0									(6,349)	[3]		(1,837)	[3]
Non-vested - End of Period (in shares)						0			42,014	65,500
Weighted Average Fair Value Per Share [Roll Forward]
Non-vested - Beginning of Period (in dollars per share)						$ 0			$ 22.68	$ 21.48
Unrestricted Shares Granted (in dollars per share)						$ 17.89									$ 19.35	[2]
Shares Vested (in dollars per share)						$ 17.89									$ 19.35			$ 18.18
Shares Forfeited (in dollars per share)						$ 0									$ 20.07	[3]		$ 20.07	[3]
Non-vested - End of Period (in dollars per share)						$ 0			$ 22.68	$ 21.48
Maximum shares allocated to each share based compensation unit (in shares)													1		1.5			1.5
Vesting period													3 years	1 year	2 years			3 years			1 year
Number of remaining shares expected to vest (in shares)															6,376
Number of top executives									4
Percentage of restricted stock units vested (in hundredths)																		53.00%
Number of shares of common stock retired to meet tax liabilities (in shares)					8,186

[1] Same for basic and diluted earnings per share

[2] Due to meeting our target, the maximum payout was reached, resulting in additional stock to be awarded.

[3] On March 11, 2013, we retired a combined total of 8,186 shares of common stock, in order to meet the minimum tax liabilities associated with the vesting of Restricted Stock held by our executive officers.