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Benefit Plans - Unfunded Status (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Jul. 13, 2016
Compensation and Retirement Disclosure [Abstract]      
Projected benefit obligation $ 30,877 $ 28,914 $ 34,319
Fair value of plan assets 23,461 21,345 $ 22,067
Underfunded status 7,416 7,569  
Other post-retirement benefits income (loss) $ 2,965 $ 2,196