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Nature of Operations and Basis of Presentation (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011
Net change in assets and liabilities relating to operating activities: |  |
Restricted cash and cash equivalents | $ (16,823) | $ (51,533)
Net cash flows provided by (used in) operating activities | 144,895 | 124,441
Net increase in cash and cash equivalents | 135,990 | 129,720
Cash and cash equivalents at beginning of period | 229,685 | 133,645
Cash and cash equivalents at end of period | 365,675 | 263,365
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 |  | 175,974
Net increase in cash and cash equivalents |  | 181,253
Cash and cash equivalents at beginning of period |  | 147,585
Cash and cash equivalents at end of period |  | 328,838
Reclassification made on Restricted Cash and Cash Equivalents [Member] | Restatement Adjustment [Member] |  |
Net change in assets and liabilities relating to operating activities: |  |
Restricted cash and cash equivalents |  | (51,533)
Net cash flows provided by (used in) operating activities |  | (51,533)
Net increase in cash and cash equivalents |  | (51,533)
Cash and cash equivalents at beginning of period |  | (13,940)
Cash and cash equivalents at end of period |  | $ (65,473)

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