Income Taxes (Narrative) (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
	Dec. 22, 2017	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Income tax expense (benefit)			$ 132,238	$ 19,464	$ 154,599	$ 36,282
Tax Year 2018 [Member]
Income Taxes [Line Items]
Income tax expense (benefit)	$ 126,600
Additional income tax expense from transition tax imposed on accumulated foreign earnings	119,900
Additional income tax expense from adjustment of deferred tax assets	$ 6,700
Australian Taxation Office [Member]
Income Taxes [Line Items]
Total additional tax liabilities related to audit		$ 150,000
Australian Taxation Office [Member] | Minimum [Member]
Income Taxes [Line Items]
Tax year under audit					2009
Australian Taxation Office [Member] | Maximum [Member]
Income Taxes [Line Items]
Tax year under audit					2013