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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net income available to stockholders | $ 260,824 | $ 203,347 | $ 231,663
Payments of Ordinary Dividends, Common Stock | (160,487) | (153,836) | (152,742)
Undistributed earnings for the period | $ 100,337 | $ 49,512 | $ 78,921
| 491,605,000 | 491,216,000 | 490,937,000
Earnings Per Share, Diluted | $ 0.53 | $ 0.41 | $ 0.47
Common Stock [Member] |  |  |
Payments of Ordinary Dividends, Common Stock | $ (159,524) | $ (152,793) | $ (151,458)
Undistributed earnings for the period | $ 99,676 | $ 49,144 | $ 78,255
| 488,365,000 | 487,569,000 | 486,794,000
Earnings Per Share, Diluted, Distributed | $ 0.33 | $ 0.31 | $ 0.31
Earnings Per Share, Diluted, Undistributed | 0.20 | 0.10 | 0.16
Earnings Per Share, Diluted | $ 0.53 | $ 0.41 | $ 0.47
Restricted Stock [Member] |  |  |
Payments of Ordinary Dividends, Common Stock | $ (963) | $ (1,042) | $ (1,284)
Undistributed earnings for the period | $ 661 | $ 368 | $ 666
| 3,240,000 | 3,647,000 | 4,143,000
Earnings Per Share, Diluted, Distributed | $ 0.30 | $ 0.29 | $ 0.31
Earnings Per Share, Diluted, Undistributed | 0.20 | 0.10 | 0.16
Earnings Per Share, Diluted | $ 0.50 | $ 0.39 | $ 0.47

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