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Business Segments (Revenue by Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Revenues: |  |  |  |  |  |  |  |  |  |  |
Domestic |  |  |  |  |  |  |  |  | $ 1,099,746 | $ 479,508 | $ 370,572
Foreign |  |  |  |  |  |  |  |  | 77,769 | 68,131 | 30,748
Total Revenues | $ 380,381 | $ 374,511 | $ 265,863 | $ 156,760 | $ 148,029 | $ 147,014 | $ 132,862 | $ 119,734 | $ 1,177,515 | $ 547,639 | $ 401,320

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