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Noncontrolling interests (Tables)
 12 Months Ended
Dec. 31, 2017
Noncontrolling Interest [Abstract]  
Reconciliation of beginning and ending balances of noncontrolling interest and redeemable noncontrolling interest
The following tables present a reconciliation of the beginning and ending balances of redeemable noncontrolling interests and noncontrolling interests for the years ended December 31, 2017 and 2016:
 
Redeemable
Noncontrolling Interests
 
Noncontrolling Interests
 
Total
 
Years Ended December 31,
 
Years Ended December 31,
 
Years Ended December 31,
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Balance, beginning of year
$
1,528,001

 
$
1,111,714

 
$
165,977

 
$
154,662

 
$
1,693,978

 
$
1,266,376

Issuance of shares
397,200

 
393,450

 
258,300

 
171,674

 
655,500

 
565,124

Adjustment to noncontrolling interests as a result of deconsolidation
(459,021
)
 
—

 
—

 
—

 
(459,021
)
 
—

(Loss) income attributable to noncontrolling interests
(94,644
)
 
100,852

 
(262,636
)
 
22,511

 
(357,280
)
 
123,363

Redemption of shares / Distributions
(367,442
)
 
(78,015
)
 
(144,923
)
 
(182,870
)
 
(512,365
)
 
(260,885
)
Balance, end of year
$
1,004,094

 
$
1,528,001

 
$
16,718

 
$
165,977

 
$
1,020,812

 
$
1,693,978