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Parent Company Condensed Financial Statements (Condensed Balance Sheet - Additional Information) (Details) - $ / shares
Dec. 31, 2021
Dec. 31, 2020
Balance sheets    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Common stock, shares issued (in shares) 167,790,645 167,240,600
Treasury stock, shares (in shares) 25,882,691 25,675,371