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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | $ 56,609 | $ 51,763 | $ 50,789
Preferred dividends |  |  |  |  |  |  |  |  | (4,875) | (4,875) | (4,875)
Net Income Available to Common Stockholders | $ 19,343 | $ 9,724 | $ 14,697 | $ 7,970 | $ 12,056 | $ 14,352 | $ 12,131 | $ 8,349 | 51,734 | 46,888 | 45,914
Net income available to common shareholders |  |  |  |  |  |  |  |  | $ 55,304 | $ 50,408 | $ 49,448
Basic Weighted Average Shares Outstanding | 24,671 | 24,669 | 24,669 | 24,657 | 24,649 | 24,605 | 24,531 | 24,514 | 24,666 | 24,575 | 24,463
Stock option awards |  |  |  |  |  |  |  |  | 216 | 237 | 222
Deferred compensation awards |  |  |  |  |  |  |  |  |  | 150 | 142
Diluted Weighted Average Shares Outstanding | 30,166 | 30,139 | 30,077 | 30,032 | 30,107 | 30,067 | 30,023 | 29,975 | 30,116 | 30,047 | 29,912
Earnings Per Share, Basic | $ 0.78 | $ 0.39 | $ 0.60 | $ 0.32 | $ 0.49 | $ 0.58 | $ 0.49 | $ 0.34 | $ 2.10 | $ 1.91 | $ 1.88
Earnings Per Share, Diluted | $ 0.67 | $ 0.35 | $ 0.52 | $ 0.30 | $ 0.43 | $ 0.51 | $ 0.43 | $ 0.31 | $ 1.84 | $ 1.68 | $ 1.65
Anti-dilutive stock equivalent awards not included in the calculation of diluted loss per share |  |  |  |  |  |  |  |  | 1,273 | 1,447 | 1,250
2018 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest on 3.25% convertible senior subordinated notes due 2017 |  |  |  |  |  |  |  |  | $ 2,050 | $ 2,021 | $ 2,030
Convertible senior subordinated notes potential shares |  |  |  |  |  |  |  |  | 2,669 | 2,669 | 2,669
2017 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest on 3.25% convertible senior subordinated notes due 2017 |  |  |  |  |  |  |  |  | $ 1,520 | $ 1,499 | $ 1,504
Convertible senior subordinated notes potential shares |  |  |  |  |  |  |  |  | 2,416 | 2,416 | 2,416

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