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Earnings Per Common Share Calculation of Numerator and Denominator in EPS table (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Numerators: |  |  |  |  |  |  |  |  |  |  |
Consolidated net income | $ 42,381 | $ 46,757 | $ 40,804 | $ 57,190 | $ 39,767 | $ 42,106 | $ 36,826 | $ 31,813 | $ 187,132 | $ 150,512 | $ 138,468
Amounts allocated to dilutive securities |  |  |  |  |  |  |  |  | 13,869 | 11,141 | 10,463
Preferred Stock distributions |  |  |  |  |  |  |  |  | 9,226 | 9,226 | 9,274
Net income available to Common Stockholders – basic |  |  |  |  |  |  |  |  | 164,037 | 130,145 | 118,731
Net income available to Common Stockholders – fully diluted |  |  |  |  |  |  |  |  | 13,869 | 11,141 | 10,463
Net Income (Loss) Available to Common Stockholders, Diluted |  |  |  |  |  |  |  |  | $ 177,906 | $ 141,286 | $ 129,194
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted average Common Shares outstanding – basic (shares) | 85,163 | 85,015 | 84,516 | 84,321 | 84,072 | 84,057 | 84,031 | 83,961 | 84,778 | 84,031 | 83,362
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Redemption of Common OP Units for Common Stockholders (shares) |  |  |  |  |  |  |  |  | 7,204 | 7,216 | 7,411
Stock options and restricted Stockholders (shares) |  |  |  |  |  |  |  |  | 587 | 660 | 738
Weighted average Common Shares outstanding – fully diluted (shares) | 92,965 | 92,910 | 92,264 | 92,041 | 91,875 | 91,940 | 91,851 | 91,777 | 92,569 | 91,907 | 91,511
Earnings per Common Share – Basic: |  |  |  |  |  |  |  |  |  |  |
Net income available for Common Stockholders (usd per share) | $ 0.43 | $ 0.48 | $ 0.42 | $ 0.60 | $ 0.41 | $ 0.44 | $ 0.38 | $ 0.32 | $ 1.93 | $ 1.55 | $ 1.42
Earnings per Common Share – Fully Diluted: |  |  |  |  |  |  |  |  |  |  |
Net income available for Common Stockholders (usd per share) | $ 0.43 | $ 0.48 | $ 0.42 | $ 0.60 | $ 0.41 | $ 0.43 | $ 0.38 | $ 0.32 | $ 1.92 | $ 1.54 | $ 1.41

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