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Segment Information - (Tables)
 12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Schedule of Financial Information of Business Segments
Financial information for the Company’s business segments is set forth below:


 
Year Ended December 31,
 
2018
 
2017
 
2016
Revenues:
 
 
 
 
 
     Self-Storage Operations
$
1,039,340

 
$
967,229

 
$
864,742

     Tenant Reinsurance
115,507

 
98,401

 
87,291

          Total segment revenues
1,154,847

 
1,065,630

 
$
952,033

 
 
 
 
 
 
Operating expenses:
 
 
 
 
 
     Self-Storage Operations
$
291,695

 
$
271,974

 
$
250,005

     Tenant Reinsurance
25,707

 
19,173

 
15,555

          Total segment operating expenses
$
317,402

 
$
291,147

 
$
265,560

 
 
 
 
 
 
Net operating income:
 
 
 
 
 
     Self-Storage Operations
747,645

 
695,255

 
$
614,737

     Tenant Reinsurance
89,800

 
79,228

 
71,736

          Total segment net operating income:
$
837,445

 
$
774,483

 
$
686,473

 
 
 
 
 
 
Total segment net operating income
$
837,445

 
$
774,483

 
$
686,473

Other components of net income (loss):
 
 
 
 
 
Property management fees and other income
41,757

 
39,379

 
39,842

General and administrative expense
(81,256
)
 
(78,961
)
 
(81,806
)
Depreciation and amortization expense
(209,050
)
 
(193,296
)
 
(182,560
)
Acquisition and other related costs(1)
—

 
—

 
(12,111
)
Gain on real estate transactions, earnout from prior acquisitions and impairment of real estate
30,807

 
112,789

 
8,465

     Interest expense
(178,436
)
 
(153,511
)
 
(133,479
)
Non-cash interest expense related to the amortization of discount on equity component of exchangeable senior notes
(4,687
)
 
(5,103
)
 
(4,980
)
     Interest income
5,292

 
6,736

 
10,998

     Equity in earnings of unconsolidated real estate ventures
14,452

 
15,331

 
12,895

Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of partners' interests
—

 
—

 
69,199

     Income tax expense
(9,244
)
 
(3,625
)
 
(15,847
)
          Net income
$
447,080

 
$
514,222

 
$
397,089


(1)    Beginning January 1, 2017, acquisition related costs have been capitalized due to the adoption of ASU 2017-01, "Business Combinations (Topic 805): Clarifying the Definition of a Business."