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Equity Other Equity Activity (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2016 | Jun. 30, 2015
Class of Stock [Line Items] |  |
Proceeds from Issuance of Common Stock |  | $ 0
Common Stock, Capital Shares Reserved for Future Issuance | $ 500,000 |
At the Market Program [Member] |  |
Class of Stock [Line Items] |  |
Proceeds from Issuance of Common Stock | 323,798 |
Payments of Stock Issuance Costs | 3,300 |
Common Stock [Member] | At the Market Program [Member] |  |
Class of Stock [Line Items] |  |
Proceeds from Issuance of Common Stock | $ (38) |
Stock Issued During Period, Shares, New Issues | 3,828,064 |

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