Annual report pursuant to Section 13 and 15(d)

Employee Benefits and Share-Based Compensation - Pension Benefits Expected to be Paid (Details 7)

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Employee Benefits and Share-Based Compensation - Pension Benefits Expected to be Paid (Details 7)
$ in Thousands
Dec. 31, 2017
USD ($)
Compensation And Retirement Disclosure [Abstract]  
2018 $ 1,050
2019 1,032
2020 1,035
2021 1,126
2022 1,217
Next five years $ 8,691