Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Stock-based Compensation [Abstract]

Summary Of RSU Vested And Expected To Vest

		Granted During the Year Ended December 31,
	Total	2019	2018	2017
Number of RSUs :
Granted	315,406	150,389	70,688	94,329
Outstanding at December 31, 2019	254,591	146,515	42,168	65,908
Vested and convertible at December 31, 2019	117,881	43,159	20,573	54,149
Scheduled to vest during:
2020	74,173	54,537	11,127	8,509
2021	39,650	25,932	10,468	3,250
2022	20,887	20,887	—	—
2023	1,000	1,000	—	—
2024	1,000	1,000	—	—
	254,591	146,515	42,168	65,908

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

	2019
	Performance-Based			Service-Based
	Vesting			Vesting
Grant date fair value	$19.48	to	$22.00	$19.40	to	$22.00
Market price on grant date	$20.85	to	$22.71	$20.85	to	$22.71
Expected annual dividend	$0.68	to	$0.72	$0.68	to	$0.72
Expected term (in years)			2.0	2.0	to	5.0
Risk-free interest rate	1.43%	to	2.56%	1.43%	to	2.56%
	2018
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			$0.60			$0.60
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			$0.56			$0.56
Expected term (in years)			3.0	3.0	to	4.0
Risk-free interest rate			1.49%	1.60%	to	1.67%

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, 2019	215,084	$	23.79
Granted	150,389		20.12
Converted	(104,338)		20.83
Forfeited	(6,544)		22.52
Outstanding at December 31, 2019	254,591	$	22.87	0.74	$	6,385
Vested and Convertible at December 31, 2019	117,881	$	24.13	—	$	2,956

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, 2019	96,112	$	11.80
Exercised	(40,766)		11.07
Outstanding at December 31, 2019	55,346	$	12.34	0.78	$	705
Exercisable at December 31, 2019	55,196	$	12.33	0.77	$	$704