Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Stock-based Compensation [Abstract]

Summary Of RSU Vested And Expected To Vest

		Granted During the Year Ended December 31,
	Total	2018	2017	2016
Number of RSUs :
Granted	272,291	70,688	94,329	107,274
Outstanding at December 31, 2018	215,084	65,390	76,033	73,661
Vested and convertible at December 31, 2018	80,348	14,233	—	66,115
Scheduled to vest during:
2019	91,581	21,178	62,857	7,546
2020	18,708	8,782	9,926	—
2021	24,447	21,197	3,250	—
	215,084	65,390	76,033	73,661

Schedule Of Share-based Payment Award Equity Instruments Other Than Options Valuation Assumptions

	2018
	Performance-Based	Service-Based
	Vesting	Vesting
Grant date fair value	$27.09	$27.09	to	$27.33
Market price on grant date	$28.25	$28.25	to	$28.50
Expected annual dividend	$.60			$.60
Expected term (in years)	2.0	2.0	to	3.0
Risk-free interest rate	2.02%	1.89%	to	2.02%
	2017
Grant date fair value	$26.27	$25.35	to	$26.00
Market price on grant date	$27.90	$27.50	to	$28.15
Expected annual dividend	$.56			$.56
Expected term (in years)	3.0	3.0	to	4.0
Risk-free interest rate	1.49%	1.60%	to	1.67%
	2016
Grant date fair value	$18.17	$18.17	to	$22.17
Market price on grant date	$18.17	$18.17	to	$22.17

RSU Activity

			Weighted-
		Weighted-	Average	Aggregate
		Average	Remaining	Intrinsic
	Number of	Grant-Date	Contractual	Value
	RSUs	Fair Value	Term (yrs.)	(in thousands)
Outstanding at January 1, 2018	274,134	$         19.64
Granted	70,688	27.10
Converted	(107,722)	15.58
Forfeited	(22,016)	22.86
Outstanding at December 31, 2018	215,084	$         23.79	0.68	$             4,291
Vested and Convertible at December 31, 2018	80,348	$         19.76	—	$             1,603

Stock Option Activity

			Weighted-
		Weighted-	Average	Aggregate
		Average	Remaining	Intrinsic
	Number of	Exercise	Contractual	Value
	Options	Price	Term (yrs.)	(in thousands)
Outstanding at January 1, 2018	159,807	$         11.35
Exercised	(63,695)	10.66
Outstanding at December 31, 2018	96,112	$         11.80	1.40	$                783
Exercisable at December 31, 2018	95,812	$         11.79	1.38	$                782