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Nature of Operations and Basis of Presentation (Tables)
9 Months Ended
Sep. 30, 2012
Nature of Operations and Basis of Presentation [Abstract]  
Condensed Consolidated Statement of Cash Flows
                         
    Nine Months Ended September 30, 2011  
    As Reported     Reclassification     Adjusted  

Condensed Consolidated Statements of Cash Flows:

                       

Net change in assets and liabilities relating to operating activities:

                       

Restricted cash and cash equivalents

  $ —       $ (51,533   $ (51,533

Net cash flows provided by (used in) operating activities

  $ 175,974     $ (51,533   $ 124,441  

Net increase in cash and cash equivalents

  $ 181,253     $ (51,533   $ 129,720  

Cash and cash equivalents at beginning of period

  $ 147,585     $ (13,940   $ 133,645  

Cash and cash equivalents at end of period

  $ 328,838     $ (65,473   $ 263,365