Equity Other Equity Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Class of Stock [Line Items]
Proceeds from Issuance of Common Stock	$ 21,937	$ 323,798
At the Market Stock Offering Program, capacity remaining	150,000
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	22,009
Payments of Stock Issuance Costs	200
Common Stock [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues		3,828,064
Common Stock [Member] | At the Market Program [Member]
Class of Stock [Line Items]
Proceeds from Issuance of Common Stock	$ (2)
Stock Issued During Period, Shares, New Issues	242,300