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Earnings Per Share (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 20, 2018
Apr. 26, 2018
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net Income (Numerator)                          
Basic EPS - common stock                     $ 189,589,000 $ 139,445,000 $ 113,747,000
Diluted EPS - common stock                     $ 189,589,000 $ 139,445,000 $ 113,747,000
Weighted Average Shares (Denominator)                          
Basic EPS - common stock (in shares)                     131,716,726 135,348,938 103,289,059
Effect of dilutive securities:                          
Stock Options and Performance Units (in shares)                     237,466 336,031 241,259
Diluted EPS - common stock (in shares)                     131,954,192 135,684,969 103,530,318
Earnings Per Share                          
Basic EPS - common stock (in dollars per share)     $ 0.35 $ 0.36 $ 0.36 $ 0.38 $ 0.13 $ 0.33 $ 0.30 $ 0.27 $ 1.44 $ 1.03 $ 1.10
Diluted EPS - common stock (in dollars per share)     $ 0.35 $ 0.36 $ 0.36 $ 0.38 $ 0.13 $ 0.33 $ 0.30 $ 0.27 $ 1.44 $ 1.03 $ 1.10
Stock options and restricted shares                          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                          
Antidilutive shares of common stock                     617,000 443,000  
Warrants                          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                          
Antidilutive shares of common stock                     0 20,379  
Convertible Notes                          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                          
Proceeds from convertible notes, net of issuance fees $ 50,000,000.0 $ 100,000,000.0