Stockholders' Agreement	12 Months Ended
Dec. 31, 2012
Stockholders' Agreement	9. Stockholders’ Agreement On December 20, 2010, Basic entered into the Third Amended and Restated Stockholders’ Agreement (the “Stockholders’ Agreement”) effective as of December 20, 2010 by and among Basic and certain affiliates of DLJ Merchant Banking party thereto (such affiliates, the “DLJ Parties”), which amended and restated the Second Amended and Restated Stockholders’ Agreement dated as of April 2, 2004, which terminated with respect to all other parties in accordance with its terms on December 21, 2010. The Stockholders’ Agreement provides for certain informational and consultation rights, along with confidentiality obligations, and registration rights for the DLJ Parties. As long as (i) any DLJ Party remains an Affiliate (as defined in the Stockholders’ Agreement) of Basic or (ii) the DLJ Parties, collectively, beneficially hold at least ten percent of the outstanding shares of Basic’s common stock, the DLJ Parties can require Basic to register shares of common stock on up to three occasions, provided that the proposed offering proceeds for the offering equal or exceed $10 million (or $5 million if Basic is able to register such securities on Form S-3). In addition such demand registration rights, the Stockholders’ Agreement provides the DLJ Parties with piggyback registration rights with respect to any proposed offering of equity securities pursuant to a registration statement filed by Basic (other than a registration statement on Form S-4 or Form S-8). Basic is also obligated under the Stockholders’ Agreement to perform certain other actions in connection with a demand registration or piggyback registration request by any of the DLJ Parties. The Stockholders’ Agreement terminates upon the earliest of (i) the dissolution, liquidation or winding-up of Basic, (ii) the date all of the DLJ Parties cease to be affiliates of Basic and the DLJ Parties, collectively, beneficially hold less than ten percent of the outstanding shares of common stock of Basic, or (iii) December 21, 2015.

9. Stockholders’ Agreement

On December 20, 2010, Basic entered into the Third Amended and Restated Stockholders’ Agreement (the “Stockholders’ Agreement”) effective as of December 20, 2010 by and among Basic and certain affiliates of DLJ Merchant Banking party thereto (such affiliates, the “DLJ Parties”), which amended and restated the Second Amended and Restated Stockholders’ Agreement dated as of April 2, 2004, which terminated with respect to all other parties in accordance with its terms on December 21, 2010.

The Stockholders’ Agreement provides for certain informational and consultation rights, along with confidentiality obligations, and registration rights for the DLJ Parties. As long as (i) any DLJ Party remains an Affiliate (as defined in the Stockholders’ Agreement) of Basic or (ii) the DLJ Parties, collectively, beneficially hold at least ten percent of the outstanding shares of Basic’s common stock, the DLJ Parties can require Basic to register shares of common stock on up to three occasions, provided that the proposed offering proceeds for the offering equal or exceed $10 million (or $5 million if Basic is able to register such securities on Form S-3). In addition such demand registration rights, the Stockholders’ Agreement provides the DLJ Parties with piggyback registration rights with respect to any proposed offering of equity securities pursuant to a registration statement filed by Basic (other than a registration statement on Form S-4 or Form S-8). Basic is also obligated under the Stockholders’ Agreement to perform certain other actions in connection with a demand registration or piggyback registration request by any of the DLJ Parties.

The Stockholders’ Agreement terminates upon the earliest of (i) the dissolution, liquidation or winding-up of Basic, (ii) the date all of the DLJ Parties cease to be affiliates of Basic and the DLJ Parties, collectively, beneficially hold less than ten percent of the outstanding shares of common stock of Basic, or (iii) December 21, 2015.