Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Transition tax on foreign earnings payable		$ 96,400
Foreign tax credit related to withholding taxes		106,700
Change in state tax expense - remeasurement of deferred tax assets		$ 10,000
Transition tax, noncurrent liability	$ 73,900
Taxes Payable, Current	$ 7,800
Federal statutory rate		21.00%	35.00%
Federal income tax rate after enactment of Tax reform (Percentage)	21.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 0	$ 0	$ 186,800
Effective Income Tax Rate Reconciliation, Tax Holiday, Amount	17,300	16,900	12,300
Transition tax on foreign earnings	0	5,602	$ (162,353)
foreign withholding tax	$ 13,100	$ 60,700
Impact of tax holiday on diluted earnings per share	$ 0.15	$ 0.14	$ 0.10
Liability for Uncertain Tax Positions, Noncurrent	$ 229,200
Change in state tax expense		$ 5,600
State [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$ 329,800
Foreign [Member]
Income Taxes [Line Items]
Tax credit carryforward expiration	2028
Federal And State [Member]
Income Taxes [Line Items]
Operating Loss Carryforwards, Date	2020 through 2034