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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Redeemable Noncontrolling Interest
The following table presents changes in redeemable noncontrolling interests:
 
Years Ended December 31,
  
2017
 
2016
 
2015
Beginning Balance as of January 1,
$
60,180

 
$
69,471

 
$
194,951

Redemptions
(910
)
 
(1,708
)
 
(155,042
)
Granted
1,666

 
2,274

 
7,703

Changes in redemption value
1,498

 
(9,604
)
 
22,809

Currency translation adjustments
452

 
(253
)
 
(950
)
Ending Balance as of December 31,
$
62,886

 
$
60,180

 
$
69,471