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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Statement of Stockholders' Equity [Abstract]        
Cash dividends declared per share (in dollars per share) $ 1.08 $ 0.90 $ 2.16 $ 1.80
Special cash dividends declared per share (in dollars per share) $ 3.00   $ 3.00