Income Per Share and Partnership Unit - Schedule of Reconciliation of the Numerator and Denominator Used in the Computation of Basic and Diluted Income Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Basic and diluted income:        
Income from continuing operations $ 45,737 $ 24,817 $ 89,315 $ 62,895
Less: dividends paid to preferred stockholders (2,588) (2,588) (5,176) (5,176)
Less: income attributable to unvested restricted stock (250) (345) (522) (728)
Income used in basic and diluted income per share from continuing operations 42,899 21,884 83,617 56,991
Loss used in basic and diluted loss per share from discontinued operations 0 (7,653) 0 (15,013)
Net income attributable to common stockholders used in basic and diluted income per share $ 42,899 $ 14,231 $ 83,617 $ 41,978
Basic weighted average shares of common stock outstanding:        
Weighted average shares of common stock outstanding 87,422,369 86,028,575 86,673,672 87,653,364
Less: Unvested weighted average shares of restricted stock (420,382) (401,251) (419,974) (361,647)
Weighted average shares of common stock outstanding used in basic income per share 87,001,987 85,627,324 86,253,698 87,291,718
Net income per share attributable to common stockholders - basic:        
Continuing operations (in USD per share) $ 0.49 $ 0.26 $ 0.97 $ 0.65
Discontinued operations (in USD per share)   (0.09)   (0.15)
Net income per share attributable to common stockholders - basic (in USD per share) $ 0.49 $ 0.17 $ 0.97 $ 0.50
Dilutive weighted average shares of common stock outstanding:        
Unsettled shares under open forward equity contracts 772,040 0 328,617 0
Weighted average shares of common stock outstanding used in diluted income per share 87,890,699 85,804,263 86,779,297 87,403,230
Net income per share attributable to common stockholders - diluted:        
Continuing operations (in USD per share) $ 0.49 $ 0.26 $ 0.96 $ 0.65
Discontinued operations (in USD per share)   (0.09)   (0.15)
Net income per share attributable to common stockholders - diluted (in USD per share) $ 0.49 $ 0.17 $ 0.96 $ 0.50
Unvested shares of restricted stock, less shares assumed repurchased at market        
Potentially dilutive shares of common stock        
Potentially dilutive shares 160,606 84,847 191,215 67,796
Unvested market-based awards        
Dilutive weighted average shares of common stock outstanding:        
Dilutive weighted average shares of common stock outstanding 116,672 176,939 196,982 111,512