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Earnings Per Common Share Calculation of Numerator and Denominator in EPS table (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 USD ($) $ / shares shares | Sep. 30, 2015 USD ($) $ / shares shares | Jun. 30, 2015 USD ($) $ / shares shares | Mar. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Sep. 30, 2014 USD ($) $ / shares shares | Jun. 30, 2014 USD ($) $ / shares shares | Mar. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) $ / shares shares
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  |  |  |  |  |  |  |  |  |  | 2
Numerators: |  |  |  |  |  |  |  |  |  |  |
Consolidated income from continuing operations | $ 39,767 | $ 42,106 | $ 36,826 | $ 31,813 | $ 34,262 | $ 30,276 | $ 30,040 | $ 43,890 | $ 150,512 | $ 138,468 | $ 77,247
Amounts allocated to dilutive securities |  |  |  |  |  |  |  |  | 11,141 | 10,463 | 9,706
Preferred Stock distributions |  |  |  |  |  |  |  |  | 9,226 | 9,274 | 9,280
Net Income (Loss) Available to Common Stockholders, Basic |  |  |  |  |  |  |  |  | 130,145 | 118,731 | 106,919
Income from continuing operations available to Common Stockholders – fully diluted |  |  |  |  |  |  |  |  | 11,141 | 10,463 | 9,706
Net Income (Loss) Available to Common Stockholders, Diluted |  |  |  |  |  |  |  |  | 141,286 | 129,194 | 116,625
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 44,569
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted average Common Stockholders outstanding—basic | shares | 84,072 | 84,057 | 84,031 | 83,961 | 83,562 | 83,531 | 83,234 | 83,116 | 84,031 | 83,362 | 83,018
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Redemption of Common OP Units for Common Stockholders | shares |  |  |  |  |  |  |  |  | 7,216 | 7,411 | 7,549
Stock options and restricted Stockholders | shares |  |  |  |  |  |  |  |  | 660 | 738 | 629
Weighted average Common Stockholders outstanding—fully diluted | shares | 91,875 | 91,940 | 91,851 | 91,777 | 91,644 | 91,528 | 91,420 | 91,353 | 91,907 | 91,511 | 91,196
Earnings per Common Share – Basic: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ / shares |  |  |  |  |  |  |  |  | $ 1.55 | $ 1.42 | $ 0.75
Income from discontinued operations | $ / shares |  |  |  |  |  |  |  |  | 0.00 | 0.00 | 0.54
Net income available for Common Stockholders | $ / shares | $ 0.41 | $ 0.44 | $ 0.38 | $ 0.32 | $ 0.35 | $ 0.31 | $ 0.31 | $ 0.46 | 1.55 | 1.42 | 1.29
Earnings per Common Share – Fully Diluted: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ / shares |  |  |  |  |  |  |  |  | 1.54 | 1.41 | 0.75
Income from discontinued operations | $ / shares |  |  |  |  |  |  |  |  | 0.00 | 0.00 | 0.53
Net income available for Common Stockholders | $ / shares | $ 0.41 | $ 0.43 | $ 0.38 | $ 0.32 | $ 0.35 | $ 0.31 | $ 0.30 | $ 0.46 | $ 1.54 | $ 1.41 | $ 1.28
Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Numerators: |  |  |  |  |  |  |  |  |  |  |
Amounts allocated to dilutive securities |  |  |  |  |  |  |  |  | $ 11,141 | $ 10,463 | $ 5,617
Net Income (Loss) Available to Common Stockholders, Basic |  |  |  |  |  |  |  |  | 130,145 | 118,731 | 62,350
Income from continuing operations available to Common Stockholders – fully diluted |  |  |  |  |  |  |  |  | 11,141 | 10,463 | 5,617
Net Income (Loss) Available to Common Stockholders, Diluted |  |  |  |  |  |  |  |  | $ 141,286 | $ 129,194 | $ 67,967

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