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Nature of Operations and Basis of Presentation (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	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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