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Condensed Consolidated Statements of Equity - USD ($)
$ in Thousands
Total
Preferred Stock
Common Stock
Additional Paid-In Capital
Treasury Stock
Distributions in Excess of Net Income
Stockholders’ Investment
Nonredeemable Noncontrolling Interests
Beginning balance at Dec. 31, 2015 $ 1,683,415   $ 220,256 $ 1,722,224 $ (134,630) $ (124,435) $ 1,683,415 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 42,218         42,218 42,218  
Common stock issued pursuant to:                
Stock based compensation 333   257 76     333  
Amortization of stock options and restricted stock, net of forfeitures 1,238   (14) 1,252     1,238  
Contributions from nonredeemable noncontrolling interest 2,525             2,525
Repurchase of common stock (13,743)       (13,743)   (13,743)  
Common dividends ($0.24 per share) (50,549)         (50,549) (50,549)  
Ending balance at Sep. 30, 2016 1,665,437   220,499 1,723,552 (148,373) (132,766) 1,662,912 2,525
Beginning balance at Dec. 31, 2016 2,514,240 $ 6,867 403,747 3,407,430 (148,373) (1,214,114) 2,455,557 58,683
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 188,088         184,907 184,907 3,181
Common stock issued pursuant to:                
Common stock offering, net of issuance costs 211,774   25,000 186,774     211,774  
Director stock grants 1,010   121 889     1,010  
Stock based compensation (886)   282 (1,168)     (886)  
Spin-off of Parkway, Inc. 545         545 545  
Common stock redemption by unit holders 0   1,203 8,865     10,068 (10,068)
Amortization of stock options and restricted stock, net of forfeitures 1,476   (3) 1,479     1,476  
Contributions from nonredeemable noncontrolling interest 1,588             1,588
Distributions to nonredeemable noncontrolling interest (1,364)             (1,364)
Common dividends ($0.24 per share) (99,151)         (99,151) (99,151)  
Ending balance at Sep. 30, 2017 $ 2,817,320 $ 6,867 $ 430,350 $ 3,604,269 $ (148,373) $ (1,127,813) $ 2,765,300 $ 52,020