Redeemable Preferred Shares	3 Months Ended
Mar. 31, 2018
Temporary Equity Disclosure [Abstract]
Redeemable Preferred Shares	Note 14 – Redeemable Preferred Shares On March 22, 2017, Superior and TPG Growth III Sidewall, L.P. (“TPG”) entered into an Investment Agreement pursuant to which Superior agreed to issue a number of shares of Series A Perpetual Convertible Preferred Stock (the “Series A redeemable preferred stock”) and Series B Perpetual Preferred Stock (the “Series B redeemable preferred stock”), par value $0.01 per share (the “Series A redeemable preferred stock” and “Series B redeemable preferred stock” referred to collectively as the “redeemable preferred stock”) to TPG for an aggregate purchase price of $150.0 million (the “Investment”). As of the closing of the Investment on May 22, 2017, Superior issued 140,202 shares of Series A redeemable preferred stock, which was equal to 19.99 percent of Superior’s common stock outstanding on such date, and 9,798 shares of Series B redeemable preferred stock to TPG. On August 30, 2017, our stockholders approved the conversion of 9,798 shares of Series B redeemable preferred stock into Series A redeemable preferred stock and all outstanding shares of Series B redeemable preferred stock were automatically converted into Series A redeemable preferred stock (the “Conversion”). Series A redeemable preferred stock has an initial stated value of $1,000 per share, par value of $0.01 per share and liquidation preference over common stock. Series A redeemable preferred stock is convertible into shares of Superior common stock equal to the number of shares determined by dividing the sum of the stated value and any accrued and unpaid dividends by the conversion price of $28.162. Series A redeemable preferred stock accrues dividends at a rate of 9 percent per annum, payable at Superior’s election either in-kind or in cash. Series A redeemable preferred stock is also entitled to participate in dividends on common stock in an amount equal to that which would have been due had the shares been converted into common stock. We may mandate conversion of the Series A redeemable preferred stock if the price of the common stock exceeds $84.49. TPG may redeem the shares upon the occurrence of any of the following events (referred to as a “redemption event”): a change in control, recapitalization, merger, sale of substantially all of the company’s assets, liquidation or delisting of the company’s common stock. In addition, TPG may, at its option, unconditionally redeem the shares at any time after May 23, 2024. Superior may, at its option, redeem in whole at any time all of the shares of Series A redeemable preferred stock outstanding. If redeemed by either party on or before October 22, 2018, the redemption value (the “redemption value”) would be $262.5 million (1.75 times stated value). If redeemed after October 22, 2018, the redemption value would be the greater of $300.0 million (2.0 times stated value) or the product of the number of common shares into which the Series A redeemable preferred stock could be converted (5.3 million shares currently) and the then current market price of the common stock. We have determined that the conversion option embedded in the redeemable preferred stock is required to be accounted for separately from the redeemable preferred stock as a derivative liability. Separation of the conversion option as a derivative liability is required because its economic characteristics are considered more akin to an equity instrument and therefore the conversion option is not considered to be clearly and closely related to the economic characteristics of the redeemable preferred stock. This is because the economic characteristics of the redeemable preferred stock are considered more akin to a debt instrument due to the fact that the shares are redeemable at the holder’s option, the redemption value is significantly greater than the face amount, the shares carry a fixed mandatory dividend and the stock price necessary to make conversion more attractive than redemption ($56.324) is significantly greater than the price at the date of issuance ($19.05), all of which lead to the conclusion that redemption is more likely than conversion. We have also determined that the early redemption option exercisable upon the occurrence of a redemption event must also be bifurcated and accounted for separately from the redeemable preferred stock at fair value, because the debt host contract involves a substantial discount (face of $150.0 million as compared to the redemption value of $300.0 million) and the exercise of the early redemption option upon the occurrence of a redemption event would accelerate the holder’s option to redeem the shares. Accordingly, we have recorded an embedded derivative liability representing the estimated combined fair value of the right of holders to receive common stock upon conversion (the “conversion option”) and the right of the holders to exercise their early redemption option upon the occurrence of a redemption event (the “early redemption option”). The embedded derivative liability is adjusted to reflect fair value at each period end with changes in fair value recorded in the “Change in fair value of redeemable preferred stock embedded derivative liability” financial statement line item of the company’s condensed consolidated statements of operations. Refer to “Note 6, Derivative Financial Instruments” for further information regarding the valuation of the embedded derivative. Since the redeemable preferred stock may be redeemed at the option of the holder, but is not mandatorily redeemable, the redeemable preferred stock has been classified as mezzanine equity and initially recognized at fair value of $150 million (the proceeds on the date of issuance) less issuance costs of $3.7 million, resulting in an initial value of $146.3 million. This amount has been further reduced by $10.9 million assigned to the embedded derivative liability at date of issuance, resulting in an adjusted initial value of $135.5 million. We are accreting the difference between the adjusted initial value of $135.5 million and the redemption value of $300 million over the seven-year period from date of issuance through May 23, 2024 (the date at which the holder has the unconditional right to redeem the shares, deemed to be the earliest likely redemption date) using the effective interest method. The accretion to the carrying value of the redeemable preferred stock is treated as a deemed dividend, recorded as a charge to retained earnings and deducted in computing earnings per share (analogous to the treatment for stated and participating dividends paid on the redeemable preferred shares). The accumulated accretion as of March 31, 2018 is $13.4 million resulting in an adjusted redeemable preferred stock balance of $148.9 million.

Note 14 – Redeemable Preferred Shares

On March 22, 2017, Superior and TPG Growth III Sidewall, L.P. (“TPG”) entered into an Investment Agreement pursuant to which Superior agreed to issue a number of shares of Series A Perpetual Convertible Preferred Stock (the “Series A redeemable preferred stock”) and Series B Perpetual Preferred Stock (the “Series B redeemable preferred stock”), par value $0.01 per share (the “Series A redeemable preferred stock” and “Series B redeemable preferred stock” referred to collectively as the “redeemable preferred stock”) to TPG for an aggregate purchase price of $150.0 million (the “Investment”). As of the closing of the Investment on May 22, 2017, Superior issued 140,202 shares of Series A redeemable preferred stock, which was equal to 19.99 percent of Superior’s common stock outstanding on such date, and 9,798 shares of Series B redeemable preferred stock to TPG.

On August 30, 2017, our stockholders approved the conversion of 9,798 shares of Series B redeemable preferred stock into Series A redeemable preferred stock and all outstanding shares of Series B redeemable preferred stock were automatically converted into Series A redeemable preferred stock (the “Conversion”). Series A redeemable preferred stock has an initial stated value of $1,000 per share, par value of $0.01 per share and liquidation preference over common stock.

Series A redeemable preferred stock is convertible into shares of Superior common stock equal to the number of shares determined by dividing the sum of the stated value and any accrued and unpaid dividends by the conversion price of $28.162. Series A redeemable preferred stock accrues dividends at a rate of 9 percent per annum, payable at Superior’s election either in-kind or in cash. Series A redeemable preferred stock is also entitled to participate in dividends on common stock in an amount equal to that which would have been due had the shares been converted into common stock.

We may mandate conversion of the Series A redeemable preferred stock if the price of the common stock exceeds $84.49. TPG may redeem the shares upon the occurrence of any of the following events (referred to as a “redemption event”): a change in control, recapitalization, merger, sale of substantially all of the company’s assets, liquidation or delisting of the company’s common stock. In addition, TPG may, at its option, unconditionally redeem the shares at any time after May 23, 2024. Superior may, at its option, redeem in whole at any time all of the shares of Series A redeemable preferred stock outstanding. If redeemed by either party on or before October 22, 2018, the redemption value (the “redemption value”) would be $262.5 million (1.75 times stated value). If redeemed after October 22, 2018, the redemption value would be the greater of $300.0 million (2.0 times stated value) or the product of the number of common shares into which the Series A redeemable preferred stock could be converted (5.3 million shares currently) and the then current market price of the common stock.

We have determined that the conversion option embedded in the redeemable preferred stock is required to be accounted for separately from the redeemable preferred stock as a derivative liability. Separation of the conversion option as a derivative liability is required because its economic characteristics are considered more akin to an equity instrument and therefore the conversion option is not considered to be clearly and closely related to the economic characteristics of the redeemable preferred stock. This is because the economic characteristics of the redeemable preferred stock are considered more akin to a debt instrument due to the fact that the shares are redeemable at the holder’s option, the redemption value is significantly greater than the face amount, the shares carry a fixed mandatory dividend and the stock price necessary to make conversion more attractive than redemption ($56.324) is significantly greater than the price at the date of issuance ($19.05), all of which lead to the conclusion that redemption is more likely than conversion.

We have also determined that the early redemption option exercisable upon the occurrence of a redemption event must also be bifurcated and accounted for separately from the redeemable preferred stock at fair value, because the debt host contract involves a substantial discount (face of $150.0 million as compared to the redemption value of $300.0 million) and the exercise of the early redemption option upon the occurrence of a redemption event would accelerate the holder’s option to redeem the shares.

Accordingly, we have recorded an embedded derivative liability representing the estimated combined fair value of the right of holders to receive common stock upon conversion (the “conversion option”) and the right of the holders to exercise their early redemption option upon the occurrence of a redemption event (the “early redemption option”). The embedded derivative liability is adjusted to reflect fair value at each period end with changes in fair value recorded in the “Change in fair value of redeemable preferred stock embedded derivative liability” financial statement line item of the company’s condensed consolidated statements of operations. Refer to “Note 6, Derivative Financial Instruments” for further information regarding the valuation of the embedded derivative.

Since the redeemable preferred stock may be redeemed at the option of the holder, but is not mandatorily redeemable, the redeemable preferred stock has been classified as mezzanine equity and initially recognized at fair value of $150 million (the proceeds on the date of issuance) less issuance costs of $3.7 million, resulting in an initial value of $146.3 million. This amount has been further reduced by $10.9 million assigned to the embedded derivative liability at date of issuance, resulting in an adjusted initial value of $135.5 million. We are accreting the difference between the adjusted initial value of $135.5 million and the redemption value of $300 million over the seven-year period from date of issuance through May 23, 2024 (the date at which the holder has the unconditional right to redeem the shares, deemed to be the earliest likely redemption date) using the effective interest method. The accretion to the carrying value of the redeemable preferred stock is treated as a deemed dividend, recorded as a charge to retained earnings and deducted in computing earnings per share (analogous to the treatment for stated and participating dividends paid on the redeemable preferred shares). The accumulated accretion as of March 31, 2018 is $13.4 million resulting in an adjusted redeemable preferred stock balance of $148.9 million.