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Reportable Operating Segments (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Revenues and total assets by geographic area |  |  |  |  |
Revenues | $ 445,013 | $ 337,436 | $ 855,008 | $ 629,009 |
% of revenue | 100.00% | 100.00% | 100.00% | 100.00% |
Total Assets | 925,085 |  | 925,085 |  | 931,207
United States |  |  |  |  |
Revenues and total assets by geographic area |  |  |  |  |
Revenues |  |  | 845,461 | 624,293 |
% of revenue |  |  | 98.90% | 99.30% |
Total Assets | 914,123 |  | 914,123 |  | 920,872
Non-United States |  |  |  |  |
Revenues and total assets by geographic area |  |  |  |  |
Revenues |  |  | 9,547 | 4,716 |
% of revenue |  |  | 1.10% | 0.70% |
Total Assets | $ 10,962 |  | $ 10,962 |  | $ 10,335

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