Stock-based Compensation (Summary of Stock Options Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Shares
Outstanding at beginning of period (in shares)	0	6,500	26,400
Granted (in shares)	0	0	0
Exercised (in shares)	0	(6,500)	(19,400)
Forfeited (in shares)	0	0	(500)
Outstanding at end of period (in shares)	0	0	6,500
Options exercisable at end of period (in shares)	0	0	6,500
Weighted-Average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 0	$ 18.60	$ 18.60
Granted (in dollars per share)	0	0	0
Exercised (in dollars per share)	0	18.60	18.60
Forfeited (in dollars per share)	0	0	18.60
Outstanding at end of period (in dollars per share)	0	0	18.60
Options exercisable at end of period (in dollars per share)	$ 0	$ 0	$ 18.60