Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

Stock-Based Compensation [Abstract]

Schedule Of Activity For Non-Vested Restricted Sock

	2016			2015			2014
	Shares	Weighted Average Fair Value at Grant Date		Shares	Weighted Average Fair Value at Grant Date		Shares	Weighted Average Fair Value at Grant Date
Non-vested at beginning of period	26,587	$	78.00	23,668	$	79.02	16,301	$	84.96
Granted	3,162		89.10	5,779		84.90	7,367		65.87
Vested	(1,284)		106.92	(2,570)		103.65	0
Forfeited	0			(290)		78.12	0
Non-vested at end of period	28,465	$	77.93	26,587	$	78.00	23,668	$	79.02