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Earnings per Share ("EPS") (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Basic EPS      
Net income $ 167,319 $ 205,104 $ 215,931
Shares (Denominator) 63,725,819 65,476,606 66,106,580
Per Share Amount $ 2.63 $ 3.13 $ 3.27
Diluted EPS      
Net Income $ 167,319 $ 205,104 $ 215,931
Potential dilutive common shares and warrants 127,316 209,078 527,240
Shares (Denominator) 63,853,135 65,685,684 66,633,820
Per Share Amount (in dollars per share) $ 2.62 $ 3.12 $ 3.24