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Earnings per Share (EPS) - Computation of Basic and Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings per Share, Basic [Abstract]            
Net income $ 39,100 $ 32,899 $ 25,241 $ 22,355 $ 71,999 $ 47,596
Basic weighted average shares outstanding (in shares) 67,590   65,664   67,143 63,891
Basic earnings per share (in dollars per share) $ 0.58   $ 0.38   $ 1.07 $ 0.74
Earnings per Share, Diluted [Abstract]            
Net income $ 39,100 $ 32,899 $ 25,241 $ 22,355 $ 71,999 $ 47,596
Warrant gain, net of tax 0   (86)   0 (418)
Diluted net income $ 39,100   $ 25,155   $ 71,999 $ 47,178
Basic weighted average shares outstanding (in shares) 67,590   65,664   67,143 63,891
Dilutive effect of issuable shares (in shares) 2,000   2,952   2,205 3,280
Dilutive weighted average shares outstanding (in shares) 69,590   68,616   69,348 67,171
Diluted earnings per share (in dollars per share) $ 0.56   $ 0.37   $ 1.04 $ 0.70
Antidilutive securities excluded from EPS calculation (in shares) 705   308   748 231