Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2017	Jun. 30, 2015	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2014
Income Tax Examination [Line Items]
Provision (benefit) for income taxes			$ 98,225	$ 48,920	$ (10,781)
U.S. federal income tax rate		35.00%	21.00%		35.00%	35.00%
Net non-current deferred tax assets			$ 55,217	71,707
Net non-current deferred tax liabilities			49,800
Total foreign tax credit carryforwards			31,300
Deferred Tax Assets, Operating Loss Carryforwards			14,900
Tax Credit Carryforward, Amount			2,300
Unrecognized tax benefits			184	1,990	$ 2,492
Expired Foreign Tax Credits	$ 19,500
Increase in Foreign Tax Credit Carryforward	$ 37,700
Unrecognized Tax Benefits that Would Impact Effective Tax Rate			200
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued			0	900	$ 800
Unrecognized Tax Benefits, Increase (Decrease) Income Tax Penalties and Interest Accrued			900	100
Decrease in Unrecognized Tax Benefits is Reasonably Possible			200
Deferred Tax Assets, Net of Valuation Allowance			84,346	99,961
Undistributed Earnings of Foreign Subsidiaries			1,500,000
Undistributed Earnings of Foreign Subsidiaries Subjected to One Time Transition Fee			1,300,000
Deferred Income Tax Liabilities, Net			49,773	$ 45,825
State and Local Jurisdiction [Member]
Income Tax Examination [Line Items]
Operating Loss Carryforwards			$ 250,000