Shareholders' Equity	3 Months Ended
Mar. 31, 2018
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Shareholders’ Equity Change in accounting principle As described in Note 2 - “New Accounting Pronouncements,” during the first quarter of 2018 the updated guidance of “Recognition and Measurement of Financial Assets and Financial Liabilities” became effective. The application of this guidance resulted in an immaterial cumulative effect adjustment to our 2018 beginning accumulated other comprehensive (loss) income and retained earnings to recognize unrealized gains on equity securities. Shareholders Rights Agreement Our Amended and Restated Rights Agreement dated July 23, 2015 (“the 2015 Agreement”) seeks to diminish the risk that our ability to use our NOLs to reduce potential future federal income tax obligations may become substantially limited and to deter certain abusive takeover practices. The benefit of the NOLs would be substantially limited, and the timing of the usage of the NOLs could be substantially delayed, if we were to experience an “ownership change” as defined by Section 382 of the Internal Revenue Code. Under the 2015 Agreement, each outstanding share of our Common Stock is accompanied by one Right. The “Distribution Date” occurs on the earlier of ten days after a public announcement that a person has become an “Acquiring Person,” or ten business days after a person announces or begins a tender offer in which consummation of such offer would result in a person becoming an “Acquiring Person.” An “Acquiring Person” is any person that becomes, by itself or together with its affiliates and associates, a beneficial owner of 5% or more of the shares of our Common Stock then outstanding, but excludes, among others, certain exempt and grandfathered persons as defined in the Agreement. The Rights are not exercisable until the Distribution Date. Each Right will initially entitle shareholders to buy one-tenth of one share of our Common Stock at a Purchase Price of $45 per full share (equivalent to $4.50 for each one-tenth share), subject to adjustment. Each exercisable Right (subject to certain limitations) will entitle its holder to purchase, at the Rights’ then-current Purchase Price, a number of our shares of Common Stock (or if after the Shares Acquisition Date, we are acquired in a business combination, common shares of the acquiror) having a market value at the time equal to twice the Purchase Price. The Rights will expire on August 1, 2018, or earlier as described in the 2015 Agreement. The Rights are redeemable at a price of $0.001 per Right at any time prior to the time a person becomes an Acquiring Person. Other than certain amendments, the Board of Directors may amend the Rights in any respect without the consent of the holders of the Rights. On April 26, 2018, our Board of Directors approved amendments to the 2015 Agreement described above (as amended and restated, the “2018 Agreement”). The only material amendment made to the 2015 Agreement was an extension of the final expiration date until March 1, 2020. The approval and effectiveness of the 2018 Agreement is subject to shareholder approval at the Annual Meeting of Shareholders, scheduled to be held in July 2018. Until such shareholder approval, the 2015 Rights Agreement remains in effect.

Shareholders’ Equity

Change in accounting principle

As described in Note 2 - “New Accounting Pronouncements,” during the first quarter of 2018 the updated guidance of “Recognition and Measurement of Financial Assets and Financial Liabilities” became effective. The application of this guidance resulted in an immaterial cumulative effect adjustment to our 2018 beginning accumulated other comprehensive (loss) income and retained earnings to recognize unrealized gains on equity securities.

Shareholders Rights Agreement

Our Amended and Restated Rights Agreement dated July 23, 2015 (“the 2015 Agreement”) seeks to diminish the risk that our ability to use our NOLs to reduce potential future federal income tax obligations may become substantially limited and to deter certain abusive takeover practices. The benefit of the NOLs would be substantially limited, and the timing of the usage of the NOLs could be substantially delayed, if we were to experience an “ownership change” as defined by Section 382 of the Internal Revenue Code.

Under the 2015 Agreement, each outstanding share of our Common Stock is accompanied by one Right. The “Distribution Date” occurs on the earlier of ten days after a public announcement that a person has become an “Acquiring Person,” or ten business days after a person announces or begins a tender offer in which consummation of such offer would result in a person becoming an “Acquiring Person.” An “Acquiring Person” is any person that becomes, by itself or together with its affiliates and associates, a beneficial owner of 5% or more of the shares of our Common Stock then outstanding, but excludes, among others, certain exempt and grandfathered persons as defined in the Agreement. The Rights are not exercisable until the Distribution Date. Each Right will initially entitle shareholders to buy one-tenth of one share of our Common Stock at a Purchase Price of $45 per full share (equivalent to $4.50 for each one-tenth share), subject to adjustment. Each exercisable Right (subject to certain limitations) will entitle its holder to purchase, at the Rights’ then-current Purchase Price, a number of our shares of Common Stock (or if after the Shares Acquisition Date, we are acquired in a business combination, common shares of the acquiror) having a market value at the time equal to twice the Purchase Price. The Rights will expire on August 1, 2018, or earlier as described in the 2015 Agreement. The Rights are redeemable at a price of $0.001 per Right at any time prior to the time a person becomes an Acquiring Person. Other than certain amendments, the Board of Directors may amend the Rights in any respect without the consent of the holders of the Rights.

On April 26, 2018, our Board of Directors approved amendments to the 2015 Agreement described above (as amended and restated, the “2018 Agreement”). The only material amendment made to the 2015 Agreement was an extension of the final expiration date until March 1, 2020. The approval and effectiveness of the 2018 Agreement is subject to shareholder approval at the Annual Meeting of Shareholders, scheduled to be held in July 2018. Until such shareholder approval, the 2015 Rights Agreement remains in effect.