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Stock Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) shares	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) d $ / shares shares	Jun. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2021 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock under employee stock purchase plan \| $			$ 5,235	$ 4,232
Share-based compensation expense \| $	$ 7,703	$ 5,869	$ 14,420	$ 11,599
Restricted Stock And Restricted Stock Unit (RSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			132,117	90,286
Restricted Stock And Restricted Stock Unit (RSU) \| Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting periods			1 year
Restricted Stock And Restricted Stock Unit (RSU) \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting periods			8 years
Market-based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			100,193	73,094
Trading days \| d			20
Trading days, lookback \| d			30
Weighted-average grant-date fair values of restricted stock awards granted (in usd per share) \| $ / shares			$ 87.11	$ 94.40
Weighted-average period to recognize compensation cost (in years)			3 years 2 months 12 days
Restricted Stock, Restricted Stock Unit (RSU), Market-based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to non-vested awards granted \| $	$ 52,900		$ 52,900		$ 44,300
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			232,310
Weighted-average period to recognize compensation cost (in years)			3 years 10 months 24 days
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum issuance of common stock (in shares)	2,000,000		2,000,000
Market value of common stock on the date of grant for incentive stock options			85.00%
Maximum earnings withheld by the employees	15.00%		15.00%
Estimated forfeiture rate			11.15%	11.15%
Issuance of shares under employee stock purchase plan (in shares)			76,741	58,145
Number of shares available for issuance (in shares)	1,218,950		1,218,950
Share-based compensation expense \| $	$ 800	$ 700	$ 1,500	$ 1,300
Minimum \| Restricted Stock And Restricted Stock Unit (RSU) \| Senior Staff
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting periods			4 years
Maximum \| Restricted Stock And Restricted Stock Unit (RSU) \| Senior Staff
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting periods			5 years
2007 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum issuance of common stock (in shares)	4,500,000		4,500,000
Purchase price of common stock, percent			85.00%
Number of options outstanding (in shares)	0		0
Number of stocks outstanding (in shares)	0		0
2015 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum issuance of common stock (in shares)	4,200,000		4,200,000
Number of options outstanding (in shares)	435,135		435,135
Number of stocks outstanding (in shares)	506,962		506,962
2015 Stock Option Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market value of common stock on the date of grant for incentive stock options			100.00%