Joint Venture Investment Shareholder Loan Conversion (Details) (Conversion of Matariki shareholder debt to preferred equity [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012
Conversion of Matariki shareholder debt to preferred equity [Member]
Debt Conversion [Line Items]
Debt Conversion, Original Debt, Amount	$ 125,532
Debt Conversion, Original Debt, Type of Debt	shareholder loans payable to the noncontrolling interest by the JV
Debt Conversion, Converted Instrument, Amount	$ 95,961	$ 0
Debt Conversion, Converted Instrument, Type	preferred equity

The type of the financial instrument that the original debt is being converted into (for example, new debt, common stock, preferred stock, etc.) in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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A textual description providing detail about the type of debt (for example, secured, unsecured, callable, convertible) that is being converted in a noncash (or part noncash) transaction. At a minimum, the disclosure includes information sufficient to provide an understanding of the nature and purpose of the debt issuance, as well as its features and the events leading to up to conversion. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments during the period.

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