Equity Other Equity Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Class of Stock [Line Items]
Proceeds from Issuance of Common Stock	$ 323,798	$ 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