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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

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