Revenue - Revenue by Category (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 369,797	$ 1,111,772
Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	244,132	739,670
Aerospace [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	125,665	372,102
Americas [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	187,208	554,963
Americas [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	98,948	288,265
Americas [Member] | Aerospace [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	88,260	266,698
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	111,674	346,205
Europe [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	86,083	273,214
Europe [Member] | Aerospace [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	25,591	72,991
Asia [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	69,062	205,204
Asia [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	58,151	175,533
Asia [Member] | Aerospace [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	10,911	29,671
Other Geographic Market [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,853	5,400
Other Geographic Market [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	950	2,658
Other Geographic Market [Member] | Aerospace [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	903	2,742
Engineered Components Products [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	84,696	265,878
Engineered Components Products [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	84,696	265,878
Engineered Components Products [Member] | Aerospace [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Molding Solutions Products [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	124,887	369,924
Molding Solutions Products [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	124,887	369,924
Molding Solutions Products [Member] | Aerospace [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Nitrogen Gas Products [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	34,549	103,868
Nitrogen Gas Products [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	34,549	103,868
Nitrogen Gas Products [Member] | Aerospace [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Aerospace Original Equipment Manufacturing Products [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	84,741	249,963
Aerospace Original Equipment Manufacturing Products [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Aerospace Original Equipment Manufacturing Products [Member] | Aerospace [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	84,741	249,963
Aerospace Aftermarket Products and Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	40,924	122,139
Aerospace Aftermarket Products and Services [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Aerospace Aftermarket Products and Services [Member] | Aerospace [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 40,924	$ 122,139
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenue transfered percent	90.00%	90.00%
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue transfered percent	10.00%	10.00%