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Earnings Per Common Share (Earnings per common share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Earnings Per Share [Abstract] |  |  |  |
Net income | $ 23,100 | $ 3,319 | $ 59,666 | $ 35,573
Non-Convertible Preferred Stock Dividend (Series A,B and D) | (1,628) | (1,627) | (4,883) | (4,883)
Convertible Preferred Stock Dividend (Series C) | (1,838) | (1,838) | (5,513) | (5,513)
Income available to common shareholders | 19,634 | (146) | 49,270 | 25,177
Effect of assumed conversion of convertible preferred stock | 1,838 | 1,838 | 5,513 | 5,513
Income available to common sharesholders assuming conversion | $ 21,472 | $ 1,692 | $ 54,783 | $ 30,690
Average common shares outstanding | 43,996 | 43,947 | 43,975 | 43,937
Average potential common shares options | 209 | 17 | 110 | 20
Average potential common shares convertible preferred stock | 7,259 | 7,138 | 7,259 | 7,138
Average common shares outstanding and equivalents | 51,464 | 51,102 | 51,344 | 51,095
Earnings per common share - basic | $ 0.45 | $ 0 | $ 1.12 | $ 0.57
Earnings per common share - diluted | $ 0.42 | $ 0 | $ 1.07 | $ 0.56

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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