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Earnings Per Share ("EPS") (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Net income $ 55,193 $ 28,852 $ 160,067 $ 74,037
Average common shares outstanding (in shares) 92,290 64,427 92,246 63,594
Average potential dilutive common shares (in shares) 551 420 551 420
Average diluted common shares (in shares) 92,841 64,847 92,797 64,014
Basic earnings per share (in dollars per share) [1] $ 0.60 $ 0.45 $ 1.74 $ 1.16
Diluted earnings per share (in dollars per share) [1] $ 0.59 $ 0.44 $ 1.72 $ 1.16
[1] All per share amounts have been restated to reflect the effect of the two-for-one stock split on February 8, 2018.