Common Stock (Schedule of Unvested Restricted Stock) (Details) (Restricted Stock, USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Share based compensation, outstanding at beginning of period (in shares)	84,446
Total restricted stock awards (in shares)	96,279
Total vested (in shares)	(58,642)
Total forfeitures (in shares)	(1,549)
Share based compensation, outstanding at end of period (in shares)	120,534		84,446
Shares outstanding, Weighted Average Grant Date Fair Value, Beginning of Period	$ 31.26
Weighted average fair value per share	$ 35.48		$ 32.45	$ 28.98
Weighted average fair value vested	$ 30.10
Weighted average fair value forfeitures	$ 31.28
Shares outstanding, Weighted Average Grant Date Fair Value, End of Period	$ 35.19		$ 31.26
Unrecognized compensation expense expected to be recognized for the weighted average contractual term of the restricted shares outstanding at end of period	$ 1,976	[1]
Aggregated intrinsic value for restricted stock oustanding at end of period	$ 4,232
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year

[1] The unrecognized compensation expense is expected to be recognized over the weighted average remaining contractual term of the outstanding restricted stock of approximately one year.