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Share-Based Compensation - Summary of Phantom Unit Activity and Changes Under CVR Partners LTIP (Details) - CVR Partners, LP - CVR Partners Long Term Incentive Plan - Phantom Units
3 Months Ended
Mar. 31, 2018
$ / shares
shares
Phantom Units  
Non-vested at the beginning of the period (in shares) | shares 1,188,206
Granted (in shares) | shares 18,262
Vested (in shares) | shares 0
Forfeited (in shares) | shares (23,320)
Non-vested at the end of the period (in shares) | shares 1,183,148
Weighted-Average Grant-Date Fair Value  
Non-vested at the beginning of the period (in dollars per share) | $ / shares $ 4.35
Granted (in dollars per share) | $ / shares 3.29
Vested (in dollars per share) | $ / shares 0.00
Forfeited (in dollars per share) | $ / shares 4.26
Non-vested at the end of the period (in dollars per share) | $ / shares $ 4.34