Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 25, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Class of Stock [Line Items]
Distribution for the excess of the market value of common shares issued above carrying value of series D preferred shares redeemed		$ 0	$ (16,205)	$ 0	$ (16,205)
Common Shares
Class of Stock [Line Items]
Common shares issued to holders of preferred shares (in shares)				144		10,412,499
Common shares from conversion of preferred shares (in shares)		2,363,103		2,363,103
Common Shares | Fundamental change conversion right
Class of Stock [Line Items]
Preferred shares converted into common shares (in shares)	10,411,779
Series D
Class of Stock [Line Items]
Liquidation preference (in dollars per share)	$ 25.00
Percentage of average closing market price of the entity's common stock based on which ratio for conversion of preferred shares into common shares is determined	98.00%
Number of consecutive trading days for calculating the average closing sale price of common shares	5 days
Preferred shares converted into common shares (in shares)				301		10,264,503
Common shares from conversion of preferred shares (in shares)		4,915,196		4,915,196
Series D | Fundamental change conversion right
Class of Stock [Line Items]
Preferred shares converted into common shares (in shares)	10,263,003
Distribution for the excess of the market value of common shares issued above carrying value of series D preferred shares redeemed	$ (16,200)