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Pension Benefit Plans - Narrative (Details) - Pension Plans, Defined Benefit
$ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
HNH  
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]  
Remainder of 2016 $ 24,700
2017 29,600
2018 39,900
2019 36,000
2020 32,700
Five years thereafter 80,600
API  
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]  
Annual expected contribution $ 900