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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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | $ 51,763 | $ 50,789 | $ 151,423
Preferred dividends |  |  |  |  |  |  |  |  | (4,875) | (4,875) | (3,656)
Excess of fair value over book value of preferred shares redeemed |  |  |  |  |  |  |  |  | 0 | 0 | (2,190)
Net Income Available to Common Stockholders | $ 12,056 | $ 14,352 | $ 12,131 | $ 8,349 | $ 9,767 | $ 12,399 | $ 12,335 | $ 11,413 | 46,888 | 45,914 | 145,577
Net income available to common shareholders |  |  |  |  |  |  |  |  | $ 50,408 | $ 49,448 | $ 150,695
Basic Weighted Average Shares Outstanding | 24,649 | 24,605 | 24,531 | 24,514 | 24,489 | 24,474 | 24,470 | 24,417 | 24,575 | 24,463 | 23,822
Stock option awards |  |  |  |  |  |  |  |  | 237 | 222 | 237
Deferred compensation awards |  |  |  |  |  |  |  |  | 150 | 142 | 123
Diluted Weighted Average Shares Outstanding | 30,107 | 30,067 | 30,023 | 29,975 | 29,944 | 29,921 | 29,913 | 29,870 | 30,047 | 29,912 | 28,763
Earnings Per Share, Basic | $ 0.49 | $ 0.58 | $ 0.49 | $ 0.34 | $ 0.40 | $ 0.51 | $ 0.50 | $ 0.47 | $ 1.91 | $ 1.88 | $ 6.11
Earnings Per Share, Diluted | $ 0.43 | $ 0.51 | $ 0.43 | $ 0.31 | $ 0.36 | $ 0.44 | $ 0.44 | $ 0.41 | $ 1.68 | $ 1.65 | $ 5.24
Anti-dilutive stock equivalent awards not included in the calculation of diluted loss per share |  |  |  |  |  |  |  |  | 1,447 | 1,250 | 963
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 |  |  |  |  |  |  |  |  | $ 2,021 | $ 2,030 | $ 2,675
Convertible senior subordinated notes potential shares |  |  |  |  |  |  |  |  | 2,669 | 2,669 | 2,165
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 |  |  |  |  |  |  |  |  | $ 1,499 | $ 1,504 | $ 2,443
Convertible senior subordinated notes potential shares |  |  |  |  |  |  |  |  | 2,416 | 2,416 | 2,416

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