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CONSOLIDATED STATEMENTS OF EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings (Accumulated Deficit)
Accumulated Other Comprehensive Income
Non-controlling interest—units in the operating partnership
Non-controlling Interest Members In Consolidated Entities
Beginning Balance at Dec. 31, 2016 $ 3,702,750 $ 1,364 $ 3,109,394 $ (16,971) $ 9,496 $ 294,859 $ 304,608
Beginning balance (in shares) at Dec. 31, 2016   136,492,235          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Contributions 3,870           3,870
Distributions (74,836)           (74,836)
Proceeds from sale of common stock, net of underwriters’ discount and transaction costs 647,382 $ 187 647,195        
Proceeds from sale of common stock, net of underwriters' discount and transaction costs (in shares)   18,656,575          
Issuance of unrestricted stock 0 $ 9 (9)        
Issuance of unrestricted stock (in shares)   917,086          
Shares withheld to satisfy tax withholding (16,041) $ (4) (16,037)        
Shares withheld to satisfy tax withholding (in shares)   (463,388)          
Declared dividend (158,544)   (106,269) (51,619)   (656)  
Amortization of stock-based compensation 15,915   13,249     2,666  
Net income 93,925     68,590   375 24,960
Change in fair value of derivatives 7,398       7,353 45  
Redemption of series A (310,855)   (24,535)   (3,622) (282,698)  
Ending Balance at Dec. 31, 2017 $ 3,910,964 $ 1,556 3,622,988 0 13,227 14,591 258,602
Ending balance (in shares) at Dec. 31, 2017 155,602,508 155,602,508          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Cumulative adjustment related to adoption of ASU 2017-12 $ 0     (231) 230 1  
Contributions 2,486           2,486
Distributions (3,112)           (3,112)
Issuance of unrestricted stock 0            
Issuance of unrestricted stock (in shares)   66,970          
Shares withheld to satisfy tax withholding (693) $ 0 (693)        
Shares withheld to satisfy tax withholding (in shares)   (20,353)          
Declared dividend (118,059)   (35,055) (82,470)   (534)  
Amortization of stock-based compensation 13,721   10,664     3,057  
Net income 92,010     82,701   299 9,010
Change in fair value of derivatives 14,429       14,377 52  
Ending Balance at Sep. 30, 2018 $ 3,911,746 $ 1,556 $ 3,597,904 $ 0 $ 27,834 $ 17,466 $ 266,986
Ending balance (in shares) at Sep. 30, 2018 155,649,125 155,649,125