Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

Components of income before income taxes consist of the following:

	Year Ended December 31,
	2017		2016			2015
United States	$	1,964,759	$	1,650,959		$	1,665,087
Foreign	113,752		(321,144		)	(439,990		)
	$	2,078,511	$	1,329,815		$	1,225,097

Schedule of Components of Income Tax Expense (Benefit)

Components of income tax expense consist of the following:

		Year Ended December 31,
		2017			2016			2015
Current:
	Federal	$	560,250		$	786,964		$	686,561
	State	(4,086		)	8,769			28,568
	Foreign	4,827			(1,362		)	4,004
	Total current tax expense	560,991			794,371			719,133
Deferred:
	Federal	317,064			(377,368		)	(119,849		)
	State	(1,258		)	13,431			(3,768		)
	Foreign	3,203			3,859			(6,475		)
	Total deferred tax expense (benefit)	319,009			(360,078		)	(130,092		)
		$	880,000		$	434,293		$	589,041

Schedule of Effective Income Tax Rate Reconciliation

A reconciliation of the U.S. statutory income tax rate to the Company's effective income tax rate is as follows:

	Year Ended December 31,
	2017		2016		2015
U.S. federal statutory tax rate	35.0	%	35.0	%	35.0	%
Impact of change in U.S. corporate tax rate (the Act)	15.7		—		—
Stock-based compensation	(9.0	)	(10.9	)	—
State and local income taxes	0.1		1.3		0.9
Taxation of non-U.S. operations	0.7		8.8		12.2
Income tax credits	(1.3	)	(1.2	)	(1.6	)
Non-deductible Branded Prescription Drug Fee	1.7		1.9		2.0
Domestic production activities deduction	(2.6	)	(2.8	)	(3.2	)
Other permanent differences	2.0		0.6		2.8
Effective income tax rate	42.3	%	32.7	%	48.1	%

Schedule of Deferred Tax Assets and Liabilities

Significant components of the Company's deferred tax assets and liabilities are as follows:

	As of December 31,
	2017			2016
Deferred tax assets:
Deferred revenue	$	102,441		$	214,587
Deferred compensation	391,034			515,984
Fixed assets and intangible assets	—			21,139
Accrued expenses	38,312			37,188
Other	26,387			49,100
	558,174			837,998
Valuation allowance	(4,187		)	(3,420		)
Total deferred tax assets	553,987			834,578
Deferred tax liabilities:
Fixed assets and intangible assets	(44,629		)	—
Other	(3,067		)	(9,275		)
Total deferred tax liabilities	(47,696		)	(9,275		)
Net deferred tax assets	$	506,291		$	825,303

Schedule Of Unrecognized Tax Benefits Roll Forward

The Company's 2012 through 2016 federal income tax returns remain open to examination by the IRS. The Company's 2012 and 2013 federal income tax returns are currently under audit by the IRS. The Company's state income tax returns from 2013 to 201