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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net income available to common stockholders (Numerator)                      
Net income as reported $ 17,984 $ 44,564 $ 40,687 $ 36,210 $ 40,630 $ 26,105 $ 23,390 $ 23,622 $ 139,445 $ 113,747 $ 92,258
Basic EPS - common stock                 139,445 113,747 92,258
Diluted EPS - common stock                 $ 139,445 $ 113,747 $ 92,258
Weighted Average Shares (Denominator)                      
Basic EPS - common stock (in shares)                 135,348,938 103,289,059 79,549,651
Effect of Dilutive Securities:                      
Stock Options and Performance Units (in shares)                 336,031 241,259 31,905
Common stock warrants (in shares)                     30,244
Diluted EPS - common stock (in shares)                 135,684,969 103,530,318 79,611,800
Per Share (Amount)                      
Basic EPS - common stock (in dollars per share) $ 0.13 $ 0.33 $ 0.30 $ 0.27 $ 0.30 $ 0.22 $ 0.29 $ 0.30 $ 1.03 $ 1.10 $ 1.16
Diluted EPS - common stock (in dollars per share) $ 0.13 $ 0.33 $ 0.30 $ 0.27 $ 0.30 $ 0.22 $ 0.29 $ 0.30 $ 1.03 $ 1.10 $ 1.16
Stock options and restricted shares                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Antidilutive shares of common stock                 443,000 519,000  
Warrants                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Antidilutive shares of common stock                 20,379 19,849