Stockholders' Equity - Range Of Exercise Prices (Details)	3 Months Ended
	Mar. 31, 2022 USD ($) $ / shares shares
Vested options
2009 Stock Option Plan
Outstanding at ending of the year (in shares) | shares	111,258
Weighted Avg. Exercise Price (in dollars per share)	$ 28.13
Weighted Avg. Remaining Contractual Life	4 years 2 months 12 days
Total Intrinsic Value | $	$ 5,002
2009 Stock Option Plan
2009 Stock Option Plan
Outstanding at ending of the year (in shares) | shares	220,937
Weighted Avg. Exercise Price (in dollars per share)	$ 36.47
Weighted Avg. Remaining Contractual Life	6 years
Total Intrinsic Value | $	$ 8,092
$23.00 - $28.00 | 2009 Stock Option Plan
2009 Stock Option Plan
Exercise prices, low end of range (in dollars per share)	$ 23.00
Exercise prices, high end of range (in dollars per share)	$ 28.00
Outstanding at ending of the year (in shares) | shares	81,987
Weighted Avg. Exercise Price (in dollars per share)	$ 26.23
Weighted Avg. Remaining Contractual Life	4 years
Total Intrinsic Value | $	$ 3,842,000
$28.00 - $32.00 | 2009 Stock Option Plan
2009 Stock Option Plan
Exercise prices, low end of range (in dollars per share)	$ 28.00
Exercise prices, high end of range (in dollars per share)	$ 32.00
Outstanding at ending of the year (in shares) | shares	14,073
Weighted Avg. Exercise Price (in dollars per share)	$ 29.84
Weighted Avg. Remaining Contractual Life	3 years 3 months 18 days
Total Intrinsic Value | $	$ 609,000
$32.00 - $47.00 | 2009 Stock Option Plan
2009 Stock Option Plan
Exercise prices, low end of range (in dollars per share)	$ 32.00
Exercise prices, high end of range (in dollars per share)	$ 47.00
Outstanding at ending of the year (in shares) | shares	124,877
Weighted Avg. Exercise Price (in dollars per share)	$ 43.93
Weighted Avg. Remaining Contractual Life	7 years 8 months 12 days
Total Intrinsic Value | $	$ 3,641,000