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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of Components of Net Periodic Benefit Costs
The components of net periodic benefit cost are as follows: 
 
Three months ended
 
Nine months ended
 
September 30,
 
September 30,
 
2016
 
2015
 
2016
 
2015
Service cost
$
2,113

 
$
2,380

 
$
6,211

 
$
7,241

Interest cost
56

 
179

 
172

 
551

Expected return on plan assets
(167
)
 
(248
)
 
(496
)
 
(756
)
Employee contributions
(448
)
 
(442
)
 
(1,203
)
 
(1,342
)
Amortization
117

 
313

 
346

 
939

Other
—

 
(821
)
 
—

 
(821
)
 
$
1,671

 
$
1,361

 
$
5,030

 
$
5,812