Common Stock (Schedule of Restricted Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
		May 29, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Share Price		$ 37.81
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		13,863	91,210
Shares awards, number of shares awarded in period		13,863	74,181
Total vested, in shares		(13,863)	(55,503)
Total forfeitures, in shares		(13,863)	(495)
Share based compensation, outstanding at end of period, in shares			109,393	91,210
Shares outstanding, weighted average grant date fair value,beginning of period			$ 36.61
Weighted average fair value per share			40.95	$ 37.17	$ 36.95
Weighted average fair value vested			35.91
Weighted average fair value forfeitures			36.88
Shares outstanding, weighted average grant date fair value, end of period			$ 39.90	$ 36.61
Unrecognized Compensation Expense at end of period	[1]		$ 1,767
Aggregated intrinsic value for shares outstanding at end of period			$ 5,087
Unrecognized compensation expense, 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.