[3] In May 1995, the company ousted John Lollar, its chairman and CEO, in part due to the ill-timing of the acquisition of Washington Energy Resources.

[7] In 2013, the company sold its assets in the Marmaton play of Oklahoma and West Texas for $160 million.

[8] In March 2018, the company sold its assets in the Eagle Ford Group to KKR and Venado Oil & Gas.

[10] In 2009, the company was cited for violations in regard to spills of toxic hydraulic fracturing fluids in Northeastern Pennsylvania.

[12] In January 2014, the company sought, and a judge granted, a temporary injunction barring anti-fracking activist Vera Scroggins from entering on any of the 312.5 square miles of land in Pennsylvania owned or leased by the company.