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Segment Reporting (Revenue by Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Revenues: |  |  |  |
Domestic | $ 368,603 | $ 144,756 | $ 780,062 | $ 385,046
Foreign | 19,680 | 17,614 | 57,984 | 50,445
Total Revenues | $ 388,283 | $ 162,370 | $ 838,046 | $ 435,491

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