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Nature of Operations and Basis of Presentation (Details 1) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2012 | Jun. 30, 2011
Net change in assets and liabilities relating to operating activities: |  |
Net cash flows provided by (used in) operating activities | $ 131,790 | $ 195,540
Restricted cash and cash equivalents | 4,038 | (19,689)
Net increase in cash and cash equivalents | 126,640 | 189,465
Cash and cash equivalents at beginning of period | 229,685 | 133,645
Cash and cash equivalents at end of period | 356,325 | 323,110
Reclassification made on Restricted Cash and Cash Equivalents [Member] | Scenario, Previously Reported [Member] |  |
Net change in assets and liabilities relating to operating activities: |  |
Net cash flows provided by (used in) operating activities |  | 215,229
Restricted cash and cash equivalents |  |
Net increase in cash and cash equivalents |  | 209,154
Cash and cash equivalents at beginning of period |  | 147,585
Cash and cash equivalents at end of period |  | 356,739
Reclassification made on Restricted Cash and Cash Equivalents [Member] | Restatement Adjustment [Member] |  |
Net change in assets and liabilities relating to operating activities: |  |
Net cash flows provided by (used in) operating activities |  | (19,689)
Restricted cash and cash equivalents |  | (19,689)
Net increase in cash and cash equivalents |  | (19,689)
Cash and cash equivalents at beginning of period |  | (13,940)
Cash and cash equivalents at end of period |  | $ (33,629)

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