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Segment Information - (Tables)
 12 Months Ended
Dec. 31, 2017
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,
 
2017
 
2016
 
2015
Revenues:
 
 
 
 
 
     Self-storage operations
$
967,229

 
$
864,742

 
$
676,138

     Tenant reinsurance
98,401

 
87,291

 
71,971

          Total segment revenues
$
1,065,630

 
$
952,033

 
$
748,109

 
 
 
 
 
 
Operating expenses:
 
 
 
 
 
     Self-storage operations
$
271,974

 
$
250,005

 
$
203,965

     Tenant reinsurance
19,173

 
15,555

 
13,033

          Total segment operating expenses
$
291,147

 
$
265,560

 
$
216,998

 
 
 
 
 
 
Net operating income:
 
 
 
 
 
     Self-storage operations
$
695,255

 
$
614,737

 
$
472,173

     Tenant reinsurance
79,228

 
71,736

 
58,938

          Total segment net operating income
$
774,483

 
$
686,473

 
$
531,111

 
 
 
 
 
 
Total segment net operating income
$
774,483

 
$
686,473

 
$
531,111

Other components of net income (loss):
 
 
 
 
 
Property management fees and other income
39,379

 
39,842

 
34,161

General and administrative expense
(78,961
)
 
(81,806
)
 
(67,758
)
Depreciation and amortization expense
(193,296
)
 
(182,560
)
 
(133,457
)
Acquisition and other related costs(1)
—

 
(12,111
)
 
(69,401
)
     Gain (loss) on real estate transactions, earnout
from prior acquisition and sale of other assets
112,789

 
8,465

 
1,501

     Interest expense
(153,511
)
 
(133,479
)
 
(95,682
)
     Non-cash interest expense related to the amortization of
discount on equity component of exchangeable senior notes
(5,103
)
 
(4,980
)
 
(3,310
)
     Interest income
3,801

 
6,148

 
3,461

     Interest income on note receivable from Preferred Operating
Partnership unit holder
2,935

 
4,850

 
4,850

     Equity in earnings of unconsolidated real estate ventures
15,331

 
12,895

 
12,351

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

 
69,199

 
2,857

     Income tax expense
(3,625
)
 
(15,847
)
 
(11,148
)
          Net income
$
514,222

 
$
397,089

 
$
209,536


(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."