Income Tax (Narrative) (Details) - USD ($)		3 Months Ended	9 Months Ended	12 Months Ended
	Jan. 01, 2018	Mar. 31, 2018	Mar. 31, 2019	Jun. 30, 2018	Dec. 31, 2017
Valuation Allowance [Line Items]
Effective tax rate		40.30%	42.00%
Statutory income tax rate	21.00%				35.00%
Provisional transition tax before foreign tax credits				$ 56,900,000
Transition tax liability after generated foreign tax credits				0
Accrued interest related to uncertain tax positions			$ 100,000
Unrecognized tax benefit			1,000,000	800,000
Valuation allowances			800,000	$ 700,000
Capital Gains Benefit Deferred Tax Asset [Member]
Valuation Allowance [Line Items]
Valuation allowances			$ 3,600,000
Foreign Cash And Other Net Current Assets [Member]
Valuation Allowance [Line Items]
Effective tax rate				15.50%
Foreign Income [Member]
Valuation Allowance [Line Items]
Effective tax rate				8.00%