Equity (Details) (Series C convertible perpetual preferred stock, USD $)	0 Months Ended	3 Months Ended
Jun. 21, 2010	Mar. 31, 2015	Jun. 21, 2010
Series C convertible perpetual preferred stock
Shareholders' equity
Preferred stock, shares issued	21,004
Conversion price (in dollars per share)	$ 3.75
Number of common stock into which preferred stock are convertible (in shares)		5,601,000
Liquidation preference (in dollars per share)	$ 1,000		$ 1,000

The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

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Shares issuable for little or no cash consideration upon the satisfaction of certain conditions (contingently issuable shares) are considered outstanding common shares and included in the computation of basic Earnings Per Share as of the date that all necessary conditions have been satisfied (in essence, when issuance of the shares is no longer contingent). Outstanding common shares that are contingently returnable (that is, subject to recall) are treated in the same manner as contingently issuable shares. Contingently issuable shares include shares that (a) will be issued in the future upon the satisfaction of specified conditions, (b) have been placed in escrow and all or part must be returned if specified conditions are not met, or (c) have been issued but the holder must return all or part if specified conditions are not met. The number of contingently issuable shares is determined by relating the portion of time within a reporting period that these shares have been outstanding to the total time in that period.

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