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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Schedule of net periodic cost (benefit)
The components of net periodic cost (benefit) of plans sponsored by us are as follows for the three and six months ended June 30, 2018 and 2017:

Three Months Ended June 30,
Six Months Ended June 30,

2018
2017
2018
2017
Service cost
$
5

$
5

$
10

$
8

Interest cost
18

7

36

14

Expected return on plan assets
(30
)
(10
)
(60
)
(20
)
Amortization of net actuarial loss
2

2

4

5

Net periodic cost (benefit)
$
(5
)
$
4

$
(10
)
$
7