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Segment Reporting (Revenue by Geographical Areas) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Revenues:        
Domestic $ 398,803 $ 246,875 $ 767,601 $ 384,319
Foreign 19,120 18,988 39,515 38,304
Total Revenues $ 417,923 $ 265,863 $ 807,116 $ 422,623