Revenue - Revenue by Category (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 375,315	$ 741,975
Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	249,577	495,538
Aerospace [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	125,738	246,437
Americas [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	185,775	367,746
Americas [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	93,326	189,320
Americas [Member] | Aerospace [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	92,449	178,426
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	115,154	234,534
Europe [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	92,414	187,127
Europe [Member] | Aerospace [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	22,740	47,407
Asia [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	72,893	136,147
Asia [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	63,043	117,382
Asia [Member] | Aerospace [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	9,850	18,765
Other Geographic Market [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,493	3,548
Other Geographic Market [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	794	1,709
Other Geographic Market [Member] | Aerospace [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	699	1,839
Engineered Components Products [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	89,170	181,183
Engineered Components Products [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	89,170	181,183
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	125,938	245,036
Molding Solutions Products [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	125,938	245,036
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	34,469	69,319
Nitrogen Gas Products [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	34,469	69,319
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	84,527	165,223
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	84,527	165,223
Aerospace Aftermarket Products and Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	41,211	81,214
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	$ 41,211	$ 81,214
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%