Income Taxes Income Taxes (Foreign) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure Foreign [Abstract]
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Percent	25.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%			35.00%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent	15.50%	35.00%
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent		38.00%	20.00%
Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Amount	$ 6,500
Deferred Foreign Income Tax Expense (Benefit)	$ 1,400		$ (9,282)	$ 0	$ 0