Income Taxes - Effective Income Tax Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%
United States	$ 326,990	$ 441,526	$ 405,508
International	255,229	268,833	404,293
Income before income taxes	582,219	710,359	809,801
Provision at statutory tax rate	203,777	248,626	283,430
State taxes, net of federal benefit	11,885	16,019	14,784
International effective tax rate differential	(22,059)	(43,008)	(48,785)
Change in valuation allowance	(8,253)	(6,266)	(49,826)
Other non-deductible expenses	2,840	2,764	4,744
Changes in tax accruals	(1,336)	(10,613)	12,437
Other	(4,511)	(3,880)	(6,299)
Provision for income taxes	$ 182,343	$ 203,642	$ 210,485