Stockholders' Equity - Stock Option Grants, Activity And Expense (Details) $ / shares in Units, $ in Thousands			1 Months Ended		12 Months Ended
	Mar. 09, 2020 $ / shares shares	Mar. 03, 2020 $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Mar. 31, 2020 $ / shares shares	Dec. 31, 2021 USD ($) individual $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Nov. 30, 2019 $ / shares shares	Nov. 30, 2018 USD ($) $ / shares shares	Nov. 30, 2017
2009 Stock Option Plan
Granted (in shares)					0	111,258,000
Assumptions used in determining the fair value of the stock options granted
Expected volatility, Minimum (as a percent)						29.70%
Expected volatility, Maximum (as a percent)						30.30%
Risk free interest rates, Minimum (as a percent)						0.50%
Risk free interest rates, Maximum (as a percent)						0.90%
Expected option term (in years)						8 years 6 months
Annual dividend yield (as a percent)						1.30%
Other Disclosures
Number of option holders | individual					14
Unrecognized compensation expense related to non-vested stock options that will be recognized during future periods
2022 | $					$ 372
2023 | $					231
2024 | $					111
2025 | $					15
Other Disclosures
Total grant date fair value of options vested | $			$ 0		428			$ 458
Intrinsic value of options exercised | $					$ 746	$ 1,216
INDUS stock option plan
Outstanding at beginning of period (in shares)					246,150,000		189,822,000
Adjustment for stock dividend (in shares)					5,413,000
Granted (in shares)					0	111,258,000
Exercised (in shares)					(29,559,000)	(54,930,000)
Forfeited (in shares)					(1,067,000)
Outstanding at end of period (in shares)			246,150,000		220,937,000	246,150,000		189,822,000
Weighted Avg. Exercise Price
Outstanding at beginning of period (in dollars per share) | $ / shares					$ 36.06		$ 28.23
Adjustment for stock dividend (in dollars per share) | $ / shares					34.29
Granted (in dollars per share) | $ / shares						$ 45.72
Exercised (in dollars per share) | $ / shares					26.34	28.58
Forfeited (in dollars per share) | $ / shares					37.49
Outstanding at end of period (in dollars per share) | $ / shares			$ 36.06		$ 36.47	$ 36.06		$ 28.23
2009 Stock Option Plan
2009 Stock Option Plan
Granted (in shares)		48,000		49,061	0
Exercise price (in dollars per share) | $ / shares		$ 45.98		$ 44.99
INDUS stock option plan
Granted (in shares)		48,000		49,061	0
2009 Stock Option Plan | Maximum | Non-employee directors
Other Disclosures
Forfeiture rates (as a percent)							2.00%	2.00%	2.00%
2020 Incentive Award Plan
2009 Stock Option Plan
Number of shares authorized		300,000
Granted (in shares)		52,000		53,149
Exercise price (in dollars per share) | $ / shares	$ 46.91	$ 46.91		$ 45.90
INDUS stock option plan
Granted (in shares)		52,000		53,149
Exercised (in shares)	(53,293)
2020 Incentive Award Plan | Non-employee directors
2009 Stock Option Plan
Granted (in shares)						111,258
INDUS stock option plan
Granted (in shares)						111,258