Share-Based Compensation (Summary of Stock Option Activity) (Details)	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Non-vested stock options outstanding, Number of shares
Non-vested stock options outstanding, beginning balance | shares	247,200
Stock options granted | shares	131,350
Stock options vested | shares	(101,142)
Stock options forfeited | shares	(13,625)
Non-vested stock options outstanding, ending balance | shares	263,783
Non-vested stock options outstanding, Weighted-average grant-date fair value
Non-vested stock options outstanding, Weighted-average grant-date fair value, beginning balance | $ / shares	$ 7.94
Stock options granted | $ / shares	10.33
Stock options vested | $ / shares	8.28
Stock options forfeited | $ / shares	7.27
Non-vested stock options outstanding, Weighted-average grant-date fair value, ending balance | $ / shares	$ 9.04
Stock options outstanding, Number of shares
Stock options outstanding, beginning balance | shares	884,050
Stock options granted | shares	131,350
Stock options exercised | shares	(48,075)
Stock options forfeited | shares	(105,300)
Stock options outstanding, ending balance | shares	862,025
Stock options outstanding, Weighted-average exercise price
Stock options outstanding, weighted-average exercise price, beginning balance | $ / shares	$ 23.53
Stock options granted | $ / shares	21.34
Stock options exercised | $ / shares	14.89
Stock options forfeited | $ / shares	32.69
Stock options outstanding, weighted-average exercise price, ending balance | $ / shares	$ 22.56
Stock options outstanding, weighted-average remaining contractual life	6 years
Stock options exercisable at end of period | shares	598,242
Stock options exercisable, weighted-average exercise price at end of period | $ / shares	$ 24.38
Stock options exercisable, weighted-average remaining contractual life	4 years 7 months 6 days