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Employee Retirement Plans	12 Months Ended
Employee Retirement Plans	Dec. 31, 2019
Employee Retirement Plans
Employee Retirement Plans	(7) Employee Retirement Plans The Company has a contributory retirement (401(k)) savings plans for non‑union employees and for union employees of Arkansas Lime Company and Texas Lime Company. Company contributions to these plans were $259, $251 and $209 in 2019, 2018 and 2017, respectively.