Cover
Mar. 09, 2020
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Mar. 09, 2020
Entity File Number 001-31446
Entity Registrant Name CIMAREX ENERGY CO.
Entity Central Index Key 0001168054
Entity Tax Identification Number 45-0466694
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 1700 Lincoln Street
Entity Address, Address Line Two Suite 3700
Entity Address, City or Town Denver
Entity Address, State or Province CO
Entity Address, Postal Zip Code 80203
City Area Code 303
Local Phone Number 295-3995
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock ($0.01 par value)
Trading Symbol XEC
Security Exchange Name NYSE
Entity Emerging Growth Company false