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Acquisition Acquisition (Schedule of Pro Forma Information) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Acquisition (Schedule of Pro Forma Information) [Abstract] |  |  |  |
Revenues | $ 1,271,201 | $ 1,054,689 | $ 3,663,574 | $ 3,050,864
Net Income | $ 23,119 | $ 32,812 | $ 81,067 | $ 69,272

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