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Schedule II: Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Schedule II: Valuation and Qualifying Accounts
Valuation and Qualifying Accounts
Allowance Accounts(1)
 
 
 
Additions
 
Deductions
 
 
Year Ended
December 31,
 
Balance at
Beginning of
Year
 
Amounts
Charged
Against
Operations, net
 
Acquired
Properties
 
Uncollectible
Accounts
Written-off
 
Disposed
Properties
 
Balance at
End of Year
2017
 
$
29,518

 
$
144,135

 
$
—

 
$
(2,732
)
 
$
(1,547
)
 
$
169,374

2016
 
36,180

 
1,177

 
—

 
(2,843
)
 
(4,996
)
 
29,518

2015
 
50,531

 
3,174

 
—

 
(17,209
)
 
(316
)
 
36,180

_______________________________________
(1)
Includes allowance for doubtful accounts, straight-line rent reserves, and allowances for loan and direct financing lease losses and excludes discontinued operations of $818 million for the year ended December 31, 2015.