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Earnings Per Share (Components of Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Nov. 15, 2019
Jun. 10, 2014
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]            
Net income $ 42,569 $ 60,883 $ 136,209 $ 92,580    
Net income (loss) available to participating securities (28) (89) (143) (477)    
Net income available to the Company’s common shareholders $ 42,541 $ 60,794 $ 136,066 $ 92,103    
Denominator:            
Weighted-average outstanding shares of common stock - basic (in shares) 46,738,073 46,279,515 45,258,819 46,914,750    
Dilutive effect of:            
Equity incentive plans (in shares) 332,532 29,557 272,178 23,211    
Convertible debt (in shares) 1,511,980 0 2,034,065 682,347    
Common stock and common stock equivalents (in shares) 48,582,585 46,309,072 47,565,062 47,620,308    
Net income per share:            
Basic (in usd per share) $ 0.91 $ 1.31 $ 3.01 $ 1.96    
Diluted (in usd per share) $ 0.88 $ 1.31 $ 2.86 $ 1.93    
3.25% Convertible Notes | Convertible Debt            
Net income per share:            
Stated interest rate           3.25%
1.75% Convertible Notes | Convertible Debt            
Net income per share:            
Stated interest rate         1.75%