Shareholders' Equity Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Mar. 20, 2015	Dec. 31, 2014
Shareholders' Equity [Abstract]
Common stock offerings, shares		5,200,000
Shares Issued, Price Per Share			$ 44.75
Proceeds from common stock offerings, net of offering costs		$ 231,316
Issuance of warrants to purchase common stock				118,200
Investment Warrants, Exercise Price	$ 22.09
Conversion of Stock, Shares Issued	71,913