Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	$ 155,751	$ 140,948	$ 133,910
State and Local Income Taxes	1,899	1,167	1,459
Change in Deferred Tax Assets Valuation Allowance	(172)	1,178	0
Foreign Income Tax Rate Differential	(51,360)	(50,041)	(44,288)
Other Adjustments	645	3,363	673
Provision for taxes	$ 106,763	$ 96,615	$ 91,754
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%