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Subsequent Events Subsequent Events (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 10, 2013 | Jun. 30, 2013 | Jun. 30, 2012
Subsequent Event [Line Items] |  |  |
Stock Issued During Period, Shares, New Issues | 12,650,000 |  |
Stock Issued During Period, Shares, Other | 1,650,000 |  |
Net proceeds from issuance of common shares | $ 181,700 | $ 181,527 | $ 0

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