Stockholders' Equity - Stock Option Grants, Activity And Expense (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) individual $ / shares shares	Mar. 31, 2021 $ / shares shares
Other Disclosures
Number of option holders | individual	14
Unrecognized compensation expense related to non-vested stock options that will be recognized during future periods
Balance of 2022 | $	$ 272
2023 | $	231
2024 | $	111
2025 | $	$ 15
INDUS stock option plan
Outstanding at beginning of period (in shares)	220,937,000	246,150,000
Adjustment for stock dividend (in shares)		5,413,000
Exercised (in shares)		(233,000)
Outstanding at end of period (in shares)	220,937,000	251,330,000
Weighted Avg. Exercise Price
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 36.47	$ 36.06
Adjustment for stock dividend (in dollars per share) | $ / shares		34.29
Exercised (in dollars per share) | $ / shares		26.31
Outstanding at end of period (in dollars per share) | $ / shares	$ 36.47	$ 35.28
2020 Incentive Award Plan
2009 Stock Option Plan
Granted (in shares)	0	0
INDUS stock option plan
Granted (in shares)	0	0