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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
	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net income available for Common Stockholders	$ 113,309	$ 60,222
Amounts allocated to dilutive securities	7,226	3,955
Net income available to Common Stockholders – Fully Diluted	$ 120,535	$ 64,177
Denominator:
Weighted average Common Shares outstanding – basic (shares)	89,780	88,524
Effect of dilutive securities:
Exchange of Common OP Units for Common Shares (shares)	5,741	5,828
Restricted stock and options (shares)	103	225
Weighted average Common Shares outstanding – Fully Diluted (shares)	95,624	94,577
Earnings per Common Share – Basic (usd per share)	$ 1.26	$ 0.68
Earnings per Common Share – Fully Diluted (usd per share)	$ 1.26	$ 0.68

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise stock options, restrictive stock units (RSUs), convertible preferred stock of an employee stock ownership plan (ESOP), and other dilutive convertible securities.

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