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Revenue (Narrative - Performance Obligations) (Details) $ in Thousands | Mar. 31, 2019 USD ($)
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Remaining performance obligation amount | $ 1,729,877
Material Rights [Member] |
Remaining performance obligation amount | 417,054
Material Rights [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 |
Remaining performance obligation amount | $ 5,132
Remaining performance obligation, expected timing of satisfaction, year | 2019
Period of remaining performance obligation, expected timing of satisfaction | 6 months
Material Rights [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01 |
Remaining performance obligation amount | $ 14,082
Remaining performance obligation, expected timing of satisfaction, year | 2020
Period of remaining performance obligation, expected timing of satisfaction | 1 year 6 months
Aerospace [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 |
Period of remaining performance obligation, expected timing of satisfaction | 2 years

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