Defined Benefit Pension and Other Postretirement Benefit Plans (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) plan	Dec. 31, 2016 USD ($)	Mar. 31, 2018 USD ($)
Pension
Defined Benefit Plan Disclosure
Contribution by employer			$ 800
Net periodic benefit (income) costs
Net service cost	$ 1,307	$ 347	3,926	$ 1,040
Interest cost	425	358	1,274	1,076
Expected return on net assets	(501)	(94)	(1,502)	(283)
Amortization:
Defined Benefit Plan, Actuarial Gain (Loss)	91	115	271	345
Prior service cost	20	21	60	64
Total net periodic benefit (income) costs	1,342	747	$ 4,029	2,242
Pension | Europe
Defined Benefit Plan Disclosure
Defined Benefit Plan, Number of Plans | plan			6
Pension | Singapore
Defined Benefit Plan Disclosure
Defined Benefit Plan, Number of Plans | plan			1
Pension | Mexico
Defined Benefit Plan Disclosure
Defined Benefit Plan, Number of Plans | plan			2
Pension | JAPAN
Defined Benefit Plan Disclosure
Defined Benefit Plan, Number of Plans | plan			1
Post-retirement Benefit Plan
Net periodic benefit (income) costs
Net service cost	0	0	$ 0	0
Interest cost	3	1	9	9
Expected return on net assets	0	0	0	0
Amortization:
Defined Benefit Plan, Actuarial Gain (Loss)	(47)	(71)	(141)	(155)
Prior service cost	0	0	0	0
Total net periodic benefit (income) costs	$ (44)	$ (70)	$ (132)	$ (146)
Subsequent Event [Member] | Pension | Maximum
Defined Benefit Plan Disclosure
Estimated employer contribution in current fiscal year					$ 3,300