Segment Information (Reconciliation of Total Segment Income from Operations to Consolidated Income before Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting [Abstract]
Income from operations	$ 306,761	$ 266,602	$ 821,604	$ 695,884
Interest expense	(9,486)	(3,297)	(28,182)	(14,921)
Other (expense) income, net	(2,670)	(287)	4,440	3,137
Income before income taxes	$ 294,605	$ 263,018	$ 797,862	$ 684,100