Shareholder's Equity (Schedule of Stock Option Activity (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of period, Number of Shares	158,721
Options exercised, Number of Shares	(76,962)
Options terminated, Number of Shares	(5,000)
Outstanding at end of period, Number of Shares	76,759	158,721
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding at beginning of period, Weighted Average Exercise Price	$ 22.89
Options exercised, Weighted Average Exercise Price	$ 22.68
Options terminated, Weighted Average Exercise Price	$ 25.76
Outstanding at end of period, Weighted Average Exercise Price	$ 22.92	$ 22.89
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding at beginning of period, Weighted Average Remaining Contractual Life (in years)	256 days	1 year 256 days
Outstanding at end of period, Weighted Average Remaining Contractual Life (in years)	256 days	1 year 256 days