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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
The impact of the implementation of ASU 2016-18 and ASU 2016-09 was as follows:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
Net cash provided by operating activities (prior to adoption of ASU 2016-09 and ASU 2016-18)
$
331,337

 
$
333,021

 
$
385,366

 
Impact of including restricted cash with cash and cash equivalents
187

 
2,669

 
(10,478
)
 
Impact of including shares related to tax withholdings in financing activities
5,107

 
5,372

 
4,233

 
Net cash provided by operating activities (after adoption of ASU 2016-09 and ASU 2016-18)
$
336,631

 
$
341,062

 
$
379,121

 
 
 
 
 
 
 
 
Net cash (used in) provided by investing activities (prior to adoption of ASU 2016-18)
$
(465,652
)
 
$
613,402

 
$
(89,660
)
 
Impact of including restricted cash with cash and cash equivalents
—

 
1,525

 
—

 
Net cash (used in) provided by investing activities (after adoption of ASU 2016-18)
$
(465,652
)
 
$
614,927

 
$
(89,660
)
 
 
 
 
 
 
 
 
Net cash provided by (used in) financing activities (prior to adoption of ASU 2016-09)
$
101,338

 
$
(934,135
)
 
$
(327,627
)
 
Impact of including shares related to tax withholdings in financing activities
(5,107
)
 
(5,372
)
 
(4,233
)
 
Net cash provided by (used in) financing activities (prior to adoption of ASU 2016-09)
$
96,231

 
$
(939,507
)
 
$
(331,860
)
 
Property Deprecation Schedule
The properties are recorded at cost and are depreciated using the straight line method over their estimated useful lives. The estimated useful lives are as follows:
Building and improvements
 
40 years (blended)
Capital improvements
 
15 - 20 years
Equipment
 
5 - 10 years
Tenant improvements
 
Term of the related lease
Fair Value of Mortgage Loans and Unsecured Notes
The following summarizes the fair value of the Company's mortgage loans and unsecured notes at December 31, 2016 and December 31, 2017 (in thousands):
        
 
 
Mortgage Loans
 
Unsecured Notes
 
 
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
As of December 31, 2016
 
$
276,650

 
$
286,684

 
$
2,280,286

 
$
2,340,762

As of December 31, 2017
 
$
267,093

 
$
267,298

 
$
2,283,513

 
$
2,359,998
Schedule of Adjustment to Previously Reported Consolidated Financial Statements
Previously, development service fee income relating to its unconsolidated joint ventures had been classified as other income and development service fee expense had been classified as general and administrative expense in amounts as follows:

 
Nine months ended
 
Year ended
 
 
September 30, 2016
 
December 31, 2015
 
 
(unaudited)
 
 
 
Other income
$
3,789

 
$
6,159

 
General and administrative expense
$
3,210

 
$
3,730