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Commitments and contingencies (Tables)
12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases
The minimum future lease commitments under noncancelable leases in effect at December 31, 2016 are as follows:
2017
$
15,455

2018
12,526

2019
10,939

2020
8,988

2021
7,858

Thereafter
10,253

 
$
66,019