Related Party Transactions Registration Rights (Details) (Investor [Member], USD $)	12 Months Ended
	Dec. 31, 2014 offering
Investor [Member]
Related Party Transaction [Line Items]
Minimum market value of registrable shares	$ 150,000,000
Maximum number of underwritten offerings obligated to effect in a 12 month period	2
Maximum number of underwritten offerings obligated to effect period	12 months
Maximum number of underwritten offerings obligated to effect	4
Share value cut back threshold	25,000,000
Maximum reimbursement of liabilities arising under the Securities Act	25,000
Reimbursement of liabilities arising under the Securities Act	$ (500,000.0)