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Earnings per Share Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | $ 127,587 | $ 107,663 | $ 72,081
Preferred dividends |  |  |  |  |  |  |  |  | 0 | 0 | (3,656)
Excess of fair value over book value of preferred shares redeemed |  |  |  |  |  |  |  |  | 0 | 0 | (2,257)
Net Income Available to Common Stockholders | $ 41,780 | $ 37,838 | $ 30,246 | $ 17,723 | $ 32,407 | $ 29,282 | $ 27,911 | $ 18,063 | 127,587 | 107,663 | 66,168
Diluted income available to common shareholders |  |  |  |  |  |  |  |  | $ 127,587 | $ 108,070 | $ 69,387
Basic Weighted Average Shares Outstanding | 28,297 | 27,981 | 27,599 | 27,498 | 27,774 | 28,469 | 28,571 | 28,124 | 27,846 | 28,234 | 25,769
Stock option awards |  |  |  |  |  |  |  |  | 412 | 295 | 342
Deferred Compensation Awards |  |  |  |  |  |  |  |  | 217 | 219 | 221
Diluted Weighted Average Shares Outstanding | 29,049 | 28,598 | 28,090 | 27,970 | 28,181 | 28,906 | 29,101 | 30,544 | 28,475 | 29,178 | 30,688
Earnings Per Share, Basic | $ 1.48 | $ 1.35 | $ 1.10 | $ 0.64 | $ 1.17 | $ 1.03 | $ 0.98 | $ 0.64 | $ 4.58 | $ 3.81 | $ 2.57
Earnings Per Share, Diluted | $ 1.44 | $ 1.32 | $ 1.08 | $ 0.63 | $ 1.15 | $ 1.01 | $ 0.96 | $ 0.60 | $ 4.48 | $ 3.70 | $ 2.26
Anti-dilutive stock equivalent awards not included in the calculation of diluted loss per share |  |  |  |  |  |  |  |  | 1 | 381 | 23
2018 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest on convertible senior subordinated notes |  |  |  |  |  |  |  |  | $ 0 | $ 407 | $ 2,113
Convertible senior subordinated notes potential shares |  |  |  |  |  |  |  |  | 0 | 430 | 2,669
2017 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest on convertible senior subordinated notes |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 1,106
Convertible senior subordinated notes potential shares |  |  |  |  |  |  |  |  | 0 | 0 | 1,687

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