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Accrued Liabilities (Changes in Restructuring Reserve Activity) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]
Charges (gains)		$ 17,013
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges, beginning of period	$ 16,522
Charges (gains)
Cash receipts (payments)	(679)
Non-cash activity
Restructuring charges, end of period	15,843
Duarte Plant Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges, beginning of period	12,504
Charges (gains)
Cash receipts (payments)
Non-cash activity
Restructuring charges, end of period	12,504
Industrial Turbomachinery Business Realignment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges, beginning of period	4,018
Charges (gains)
Cash receipts (payments)	(679)
Non-cash activity
Restructuring charges, end of period	$ 3,339