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Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Net Income |  | $ 25,780 | $ 21,583 | $ 72,087 | $ 62,654
Earnings allocated to participating securities - preferred shares |  | 45 | 42 | 127 | 121
Earnings allocated to participating securities - nonvested restricted shares |  | 296 | 216 | 772 | 598
Earnings allocated to common shareholders, Basic |  | $ 25,439 | $ 21,325 | $ 71,188 | $ 61,935
Weighted average common shares outstanding |  | 57,051 | 52,112 | 57,007 | 51,772
Basic earnings per common share |  | $ 0.45 | $ 0.41 | $ 1.25 | $ 1.20
Earnings allocated to common shareholders, Diluted | [1] | $ 25,439 | $ 21,325 | $ 71,188 | $ 61,940
Dilutive effect of equity awards and warrants |  | 13 | 404 | 14 | 707
Weighted average diluted common shares outstanding |  | 57,064 | 52,516 | 57,021 | 52,479
Diluted earnings per common share |  | $ 0.45 | $ 0.41 | $ 1.25 | $ 1.18
Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive. |  | 29 | 58 | 40 | 67
[1] | Earnings allocated to common shareholders for basic and diluted EPS may differ under the two-class method as a result of adding common stock equivalents for options and warrants to dilutive shares outstanding, which alters the ratio used to allocate earnings to common shareholders and participating securities for the purposes of calculating diluted EPS.

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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