XML 67 R58.htm IDEA: XBRL DOCUMENT v3.19.3
Shareholders' Equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Nov. 19, 2018
Nov. 13, 2018
Class of Stock [Line Items]                      
Stock Issued During Period, Shares, New Issues     1,093,575 1,089,700              
Common stock shares authorized (in shares)     200,000,000       200,000,000 200,000,000      
Net proceeds from equity offering             $ 694,103 $ 395,092 $ 98,755    
Forward sales equity agreement, forward rate per share     $ 108.70 $ 101.41 $ 95.46 $ 91.77   $ 0      
Forward sales equity agreement, shares     1,423,599 1,050,563 1,670,509 2,668,464          
Shelf Registration Statement                      
Class of Stock [Line Items]                      
Debt and equity securities authorized for issuance                     $ 3,000,000
Debt and equity securities authorized for issuance value remaining     $ 1,300,000       1,300,000        
At-The-Market                      
Class of Stock [Line Items]                      
Value of shares authorized for issuance                   $ 500,000  
Value of shares available for issuance     75,000       75,000        
Forward sales equity agreement, settlement in cash     425,000       $ 425,000        
Forward sales equity agreement, shares             4,144,671        
Common Stock Block Trade                      
Class of Stock [Line Items]                      
Stock Issued During Period, Shares, New Issues 5,390,836 4,558,404                  
Proceeds from issuance of common stock gross $ 500,000 $ 400,000                  
Net proceeds from equity offering $ 494,100 $ 395,100                  
Forward sales equity agreement, settlement in cash     247,500       $ 247,500        
Forward sales equity agreement, shares             2,668,464        
Forward Sales Equity Agreements                      
Class of Stock [Line Items]                      
Stock Issued During Period, Shares, New Issues             2,183,275        
Net proceeds from equity offering             $ 200,000        
Forward sales equity agreement, settlement in cash     $ 463,400       $ 463,400        
Forward sales equity agreement, forward rate per share             $ 100.08