Income Taxes (Narrative) (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Income Taxes [Abstract]
Unrecognized tax benefits relating to UTPs	$ 70,000
Unrecognized tax benefits, income tax penalties accrued	0
Unrecognized tax benefits, interest on income taxes accrued	8,400
Potential change in unrecognized tax benefits during next twelve months	27,300
Unrecognized tax benefits that would reduce the income tax provision	$ 46,300