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Stock repurchase program	12 Months Ended
	Dec. 31, 2021
Stock repurchase program [Abstract]
Stock repurchase program	13. Stock repurchase program We use the cost method to account for treasury stock purchases, under which the price paid for the stock is charged to the treasury stock account.  Repurchases of our common stock are accounted for as of the settlement date.  During 2021 and 2020, we did not repurchase any shares of our common stock.  From January 1, 2005 through December 31, 2019, we repurchased a total of 4,044,842 shares of common stock for $32.1 million, at an average price of $7.94 per share.

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- Definition

The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-URI http://asc.fasb.org/subtopic&trid=2208821

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