XML 76 R62.htm IDEA: XBRL DOCUMENT v3.10.0.1
Common and Preferred Shares Common Shares (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Apr. 06, 2017
Feb. 12, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash Dividends Paid [Line Items]          
Common Stock, Shares, Issued     77,226,443 76,858,632  
Net proceeds from issuance of common shares     $ 956 $ 99,069 $ 142,628
Stock Issued During Period, Shares, Acquisitions 8,851,264        
Common Stock [Member]          
Cash Dividends Paid [Line Items]          
Common stock declared dividends per share     $ 4.32 $ 4.08  
Total Cash Distribution Per Share [Member] | Common Stock [Member]          
Cash Dividends Paid [Line Items]          
Common Stock, Dividends, Per Share, Cash Paid     4.3000 4.0600  
Taxable Ordinary Income [Member] | Common Stock [Member]          
Cash Dividends Paid [Line Items]          
Common Stock, Dividends, Per Share, Cash Paid     4.1253 3.5434  
Common Stock, Dividends, Per Share, Cash Paid     4.1253    
Return of Capital [Member] | Common Stock [Member]          
Cash Dividends Paid [Line Items]          
Common Stock, Dividends, Per Share, Cash Paid     0.0000 0.2762  
Long-term Capital Gain [Member] | Common Stock [Member]          
Cash Dividends Paid [Line Items]          
Common Stock, Dividends, Per Share, Cash Paid     0.1747 0.2404  
Unrecaptured Section 1250 gain     $ 0.0102 $ 0.0972  
direct share purchase plan [Member]          
Cash Dividends Paid [Line Items]          
Common Stock, Shares, Issued       1,382,730  
Net proceeds from issuance of common shares       $ 98,200  
Common Stock [Member]          
Cash Dividends Paid [Line Items]          
Stock Issued During Period, Shares, Acquisitions 8,851,264     8,851,264  
Subsequent Event [Member] | direct share purchase plan [Member]          
Cash Dividends Paid [Line Items]          
Common Stock, Shares, Issued   490,310      
Net proceeds from issuance of common shares   $ 35,600