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, 2020	Mar. 31, 2019
Numerators:
Net income available for common stockholders	$ 66,875	$ 113,309
Amounts allocated to dilutive securities	3,849	7,226
Net income available for common stockholders – fully diluted	$ 70,724	$ 120,535
Denominators:
Weighted average common shares outstanding – basic (in shares)	181,729	179,560
Effect of dilutive securities:
Exchange of common OP units for common shares (in shares)	10,491	11,482
Restricted stock and options (in shares)	344	206
Weighted average common shares outstanding – fully diluted (in shares)	192,564	191,248
Earnings per common share – basic (usd per share)	$ 0.37	$ 0.63
Earnings per common share – fully diluted (usd per share)	$ 0.37	$ 0.63

Earnings Per Share Basic And Diluted Denominator [Abstract]

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Earnings Per Share Basic And Diluted Numerator [Abstract]

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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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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible preferred stock using the if-converted method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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