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Leases (Tables)
12 Months Ended
Dec. 31, 2016
Leases [Abstract]  
Future minimum lease payments under operating leases
Future minimum lease payments under operating leases are (in thousands):
 
Operating Leases

2017
$
2,625

2018
2,348

2019
2,348

2020
1,882

2021
1,881

Thereafter
34,722

Total minimum lease payments
$
45,806