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Fair value of financial instruments (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Assets, Liabilities and Temporary Equity Measured at Fair Value on a Recurring Basis
The following table summarizes the Company’s assets, liabilities and temporary equity that are measured at fair value on a recurring basis as of June 30, 2018: 
 
Total
 
Quoted prices in
active markets for
identical assets
(Level 1)
 
Significant other
observable inputs
(Level 2)
 
Significant
unobservable
inputs
(Level 3)
Assets
 

 
 

 
 

 
 

Investments in mutual funds and common stock
$
36,500

 
$
36,500

 
$
—

 
$
—

Interest rate cap agreements
$
2,085

 
$
—

 
$
2,085

 
$
—

Liabilities
 
 
 

 
 

 
 

Contingent earn-out obligations
$
7,489

 
$
—

 
$
—

 
$
7,489

Temporary equity
 

 
 

 
 

 
 

Noncontrolling interests subject to put provisions
$
1,047,158

 
$
—

 
$
—

 
$
1,047,158