Contingent Liability Contingent Liability (Notes)	9 Months Ended
Sep. 30, 2018
Contingent Liability [Abstract]
Environmental Contingency	Contingent Liabilities In 2012, the Company identified that a site it owns in Decatur, Alabama, contains hazardous substances in the soil and groundwater as a result of historical operations prior to the Company's ownership. The Company retained an environmental consulting firm to further investigate the contamination including the measurement and monitoring of the site and the site was enrolled in the Alabama Department of Environmental Management (“ADEM") voluntary cleanup program. As of December 31, 2017, the Company had received estimates from its environmental consulting firm for two remediation solutions based on a chemical injection process. The first solution consisted of chemical injections throughout the entire site to directly eliminate the hazardous substances in the soil and groundwater. The second solution consisted of chemical injections around the perimeter of the site to prevent the migration of the hazardous chemicals off-site. Neither solution required additional excavation or repairs to be made to the property. The estimated expenditures over an 18 month period under the two injection scenarios ranged from $0.9 million to $2.0 million. The Company had determined that it would initially proceed with the method of injecting chemicals around the perimeter of the site to prevent the migration of the hazardous chemicals off-site. As of December 31, 2017, approximately $1.0 million remained accrued for this remediation. In June 2018, the Company received updated environmental remediation estimates from its environmental consulting firm based on information analyzed from further data collection and consultation with ADEM on their anticipated requirements. The updated remediation plan expands the chemical injection process over a larger area than previously estimated, including under the building on the property. The updated plan also requires four consecutive quarters of monitoring the affected area after the injection process is completed. Based upon feedback received from ADEM, the Company accrued an additional $0.5 million of expense in the second quarter of 2018 to bring the total liability to $1.4 million which represents the most likely outcome. This plan is expected to be approved by ADEM with remediation efforts commencing in the first quarter of 2019. The Company believes the environmental remediation liability of $1.4 million currently accrued will be sufficient to cover the cost of the plan. The Company does not expect to capitalize any amounts related to the remediation plan.

Contingent Liabilities

In 2012, the Company identified that a site it owns in Decatur, Alabama, contains hazardous substances in the soil and groundwater as a result of historical operations prior to the Company's ownership. The Company retained an environmental consulting firm to further investigate the contamination including the measurement and monitoring of the site and the site was enrolled in the Alabama Department of Environmental Management (“ADEM") voluntary cleanup program.

As of December 31, 2017, the Company had received estimates from its environmental consulting firm for two remediation solutions based on a chemical injection process. The first solution consisted of chemical injections throughout the entire site to directly eliminate the hazardous substances in the soil and groundwater. The second solution consisted of chemical injections around the perimeter of the site to prevent the migration of the hazardous chemicals off-site. Neither solution required additional excavation or repairs to be made to the property. The estimated expenditures over an 18 month period under the two injection scenarios ranged from $0.9 million to $2.0 million. The Company had determined that it would initially proceed with the method of injecting chemicals around the perimeter of the site to prevent the migration of the hazardous chemicals off-site. As of December 31, 2017, approximately $1.0 million remained accrued for this remediation.

In June 2018, the Company received updated environmental remediation estimates from its environmental consulting firm based on information analyzed from further data collection and consultation with ADEM on their anticipated requirements. The updated remediation plan expands the chemical injection process over a larger area than previously estimated, including under the building on the property. The updated plan also requires four consecutive quarters of monitoring the affected area after the injection process is completed. Based upon feedback received from ADEM, the Company accrued an additional $0.5 million of expense in the second quarter of 2018 to bring the total liability to $1.4 million which represents the most likely outcome. This plan is expected to be approved by ADEM with remediation efforts commencing in the first quarter of 2019. The Company believes the environmental remediation liability of $1.4 million currently accrued will be sufficient to cover the cost of the plan. The Company does not expect to capitalize any amounts related to the remediation plan.