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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis
Financial assets and liabilities measured at fair value on a recurring basis are summarized below (in thousands):
 
Fair Value Measurements as of
December 31, 2017
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets
 
 
 
 
 
 
 
Foreign currency exchange contracts
$
—

 
$
1,912

 
$
—

 
$
1,912

Interest rate cap contracts
—

 
3,922

 
—

 
3,922

Liabilities
 
 
 
 
 
 
 
Foreign currency exchange contracts
—

 
(1,110
)
 
—

 
(1,110
)
Interest rate swap agreements
—

 
(7
)
 
—

 
(7
)
Contingent consideration
—

 
—

 
(10,612
)
 
(10,612
)
Temporary Equity
 
 
 
 
 
 
 
Redeemable noncontrolling interest
—

 
—

 
(151,978
)
 
(151,978
)
 
Fair Value Measurements as of
December 31, 2016
  
Level 1
 
Level 2
 
Level 3
 
Total
Assets
 
 
 
 
 
 
 
Foreign currency exchange contracts
$
—

 
$
1,122

 
$
—

 
$
1,122

Liabilities
 
 
 
 
 
 
 
Foreign currency exchange contracts
—

 
(1,360
)
 
—

 
(1,360
)
Interest rate swap agreements
—

 
(131
)
 
—

 
(131
)
Contingent consideration
—

 
—

 
(2,531
)
 
(2,531
)
Temporary Equity
 
 
 
 
 
 
 
Redeemable noncontrolling interest
—

 
—

 
(45,755
)
 
(45,755
)
Schedule of Fair Value of Contingent Consideration
The following table provides a roll-forward of the fair value of contingent consideration for the years ended December 31, 2017, 2016 and 2015 (in thousands):
 
Amount
Balance at December 31, 2014
$
—

Issuance of contingent consideration in connection with acquisition
10,587

Change in fair value of contingent consideration
132

Effect of foreign currency translation
(316
)
Balance at December 31, 2015
10,403

Change in fair value of contingent consideration
(7,602
)
Effect of foreign currency translation
(270
)
Balance at December 31, 2016
2,531

Issuance of contingent consideration in connection with acquisition
10,808

Change in fair value of contingent consideration
(2,465
)
Payment of contingent consideration
(781
)
Effect of foreign currency translation
519

Balance at December 31, 2017
$
10,612
Change in Redeemable Noncontrolling Interests
The components of the change in the redeemable noncontrolling interest for the years ended December 31, 2017, 2016 and 2015 are presented in the following table (in thousands):
 
Amount
Balance at December 31, 2014
$
28,885

Addition to redeemable noncontrolling interest
9,409

Net income attributable to redeemable noncontrolling interest
1,371

Adjustment of the redeemable noncontrolling interest to fair value
2,349

Effect of foreign currency translation attributable to redeemable noncontrolling interest
(3,390
)
Balance at December 31, 2015
38,624

Addition to redeemable noncontrolling interest
826

Redemption of redeemable noncontrolling interest
(3,562
)
Net loss attributable to redeemable noncontrolling interest
(47,831
)
Adjustment of the redeemable noncontrolling interest to fair value
74,194

Effect of foreign currency translation attributable to redeemable noncontrolling interest
(16,496
)
Balance at December 31, 2016
45,755

Addition to redeemable noncontrolling interest
277

Net loss attributable to redeemable noncontrolling interest
(4,905
)
Adjustment of the redeemable noncontrolling interest to fair value
108,296

Effect of foreign currency translation attributable to redeemable noncontrolling interest
2,555

Balance at December 31, 2017
$
151,978