Income Taxes (Narrative) (Details) $ / shares in Units, $ in Thousands, € in Millions, DKK in Millions			3 Months Ended	12 Months Ended			36 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2014 EUR (€)	Dec. 31, 2016 USD ($) $ / shares	Dec. 31, 2015 USD ($) $ / shares	Dec. 31, 2014 USD ($) $ / shares	Dec. 31, 2012 DKK	Dec. 31, 2013 USD ($)	Dec. 10, 2013 DKK
Net deferred tax liabilities	$ 2,851,800			$ 2,851,800	$ 3,106,700
Valuation allowance, deferred tax asset, change in amount				$ 92,000
Effective income tax rate				17.50%	14.40%	21.50%
Statutory federal income tax rate				35.00%	35.00%	35.00%
Income tax payments				$ 767,000	$ 584,000	$ 569,000
Tax deductions attributable to stock-based compensation				99,000	147,000	82,000
Excess tax benefit from share-based compensation, financing activities				50,000	88,000	50,000
Deferred tax assets, valuation allowances	306,500			306,500	215,000
Gross unrecognized tax benefits	992,200	$ 728,500		992,200	990,200	728,500		$ 689,000
Unrecognized tax benefits, net of offsetting indirect tax benefits					905,000
Unrecognized tax benefits, indirect tax benefits					233,000
Potential interest and penalties					148,000
Recognized potential interest and penalties				47,000	39,000	44,000
Unrecognized tax benefits that would impact effective tax rate	933,000			933,000
Cash and equivalents	963,700	3,005,600		963,700	$ 790,800	$ 3,005,600		$ 3,115,200
Undistributed earnings of foreign subsidiaries	23,000,000			$ 23,000,000
Effective income tax rate reconciliation,other reconciling items, percent				(3.50%)	(2.90%)	2.50%
International
Cash and equivalents	648,000			$ 648,000
Entity | United States
Net deferred tax liabilities	2,500,000			2,500,000	$ 2,700,000
Entity | International
Net deferred tax liabilities	374,000			374,000	367,000
Foreign tax authority
Income tax holiday, aggregate dollar amount				$ 61,000	$ 33,000	$ 16,000
Income tax holiday, income tax benefits per share | $ / shares				$ 0.09	$ 0.05	$ 0.02
Foreign tax authority | Denmark, Kroner
Income tax examination, amount of tax assessments | DKK									DKK 1,400
Income tax examination, amount of potential additional tax assessments | DKK							DKK 814
Foreign tax authority | USD
Income tax examination, amount of tax assessments	195,000			$ 195,000
Income tax examination, amount of potential additional tax assessments	115,000
Tax adjustments, settlements, and unusual provisions		$ 60,000
Foreign tax authority | Euro
Tax adjustments, settlements, and unusual provisions | €			€ 49
Discontinued operations
Net deferred tax liabilities					$ 87,000
Continuing operations
Net operating loss carryforwards	757,000			757,000
Operating loss carryforwards, valuation allowances	240,000			240,000
Gross unrecognized tax benefits	992,000			992,000
Unrecognized tax benefits, net of offsetting indirect tax benefits	933,000			933,000
Unrecognized tax benefits, indirect tax benefits	179,000			179,000
Potential interest and penalties	120,000			120,000
Estimated reduction in unrecognized tax benefits within twelve months	(250,000)			(250,000)
Continuing operations | General business and foreign tax credit
Tax credit carryforwards	339,000			339,000
Tax credit carryforward, valuation allowance	24,000			24,000
Deferred tax asset, due to acquisitions
Valuation allowance, deferred tax asset, change in amount				21,000
Deferred tax asset, other | Continuing operations
Deferred tax assets, valuation allowances	$ 42,000			$ 42,000