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Taxes (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Effective Tax Rate Reconciliation, Excess Tax Benefits	$ (35,171)	$ 0	$ 0
Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	200,978	176,467	162,198
State and Local Income Taxes	376	3,064	2,551
Change in Deferred Tax Assets Valuation Allowance	0	0	(1,098)
Provisional one-time charge on US tax reform	(71,982)	0	0
Foreign Income Tax Rate Differential	(43,691)	(65,917)	(54,798)
Other Adjustments	3,776	6,209	1,751
Provision for taxes	$ 198,250	$ 119,823	$ 110,604
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%

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Amount of realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit).

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