KOSMOS ENERGY LTD. Notes to Consolidated Financial Statements (Continued) 5. Property and Equipment Property and equipment is stated at cost and consisted of the following: December 31, 2017 2016 (In thousands) Oil and gas properties: Proved properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 1,653,616 $1,385,331 Unproved properties . . . . . . . . . . . . . . . . . . . . . . . . . . 465,109 919,056 Support equipment and facilities . . . . . . . . . . . . . . . . . 1,427,054 1,386,448 Total oil and gas properties . . . . . . . . . . . . . . . . . . . . 3,545,779 3,690,835 Accumulated depletion . . . . . . . . . . . . . . . . . . . . . . . . (1,234,806) (989,946) Oil and gas properties, net . . . . . . . . . . . . . . . . . . . . . . . 2,310,973 2,700,889 Other property . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39,405 37,186 Accumulated depreciation . . . . . . . . . . . . . . . . . . . . . . (32,550) (29,183) Other property, net . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6,855 8,003 Property and equipment, net . . . . . . . . . . . . . . . . . . . . . . $ 2,317,828 $2,708,892 We recorded depletion expense of $244.9 million, $131.5 million and $146.6 million for the years ended December 31, 2017, 2016 and 2015, respectively. 6. Suspended Well Costs The Company capitalizes exploratory well costs as unproved properties within oil and gas properties until a determination is made that the well has either found proved reserves or is impaired. If proved reserves are found, the capitalized exploratory well costs are reclassified to proved properties. Well costs are charged to exploration expense if the exploratory well is determined to be impaired. The following table reflects the Company’s capitalized exploratory well costs on completed wells as of and during the years ended December 31, 2017, 2016 and 2015. The table excludes $43.2 million, $2.4 million and $70.3 million in costs that were capitalized and subsequently expensed during the same year for the years ended December 31, 2017, 2016 and 2015, respectively. During 2017, the exploratory 123