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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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