Stock-Based Compensation (Summary of Restricted Share and Performance Share Activity) (Details) - Restricted Stock	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Time-Based
Number of Shares
Outstanding - beginning of year (in shares) | shares	471,634
Granted (in shares) | shares	6,000
Vested (in shares) | shares	(15,667)
Forfeited (in shares) | shares	(5,000)
Outstanding - end of year (in shares) | shares	456,967
Weighted Average Grant Date Fair Value
Outstanding - beginning of year (in dollars per share) | $ / shares	$ 32.06
Granted (in dollars per share) | $ / shares	35.13
Vested (in dollars per share) | $ / shares	36.83
Forfeited (in dollars per share) | $ / shares	37.55
Outstanding - end of year (in dollars per share) | $ / shares	$ 31.96
Performance-Based
Number of Shares
Outstanding - beginning of year (in shares) | shares	50,000
Granted (in shares) | shares	0
Vested (in shares) | shares	0
Forfeited (in shares) | shares	0
Outstanding - end of year (in shares) | shares	50,000
Weighted Average Grant Date Fair Value
Outstanding - beginning of year (in dollars per share) | $ / shares	$ 32.55
Granted (in dollars per share) | $ / shares	0.00
Vested (in dollars per share) | $ / shares	0.00
Forfeited (in dollars per share) | $ / shares	0.00
Outstanding - end of year (in dollars per share) | $ / shares	$ 32.55