Commitments and Contingencies (Notes)	6 Months Ended
Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	COMMITMENTS AND CONTINGENCIES: From time to time, the Company is a defendant in certain lawsuits and a party to certain arbitrations resulting from the Company's operations in the ordinary course as the nature of the Company's business exposes it to the potential for various claims and litigation, including those related to property damage, personal injury, freight loss, labor and employment, environmental and other matters. The Company maintains insurance policies to mitigate the financial risk associated with such claims. However, any material changes to pending litigation or a catastrophic rail accident or series of accidents involving material freight loss or property damage, personal injuries or environmental liability or other claims or disputes that are not covered by insurance could have a material adverse effect on the Company's results of operations, financial condition and liquidity. Management believes there are adequate provisions in the financial statements for any probable liabilities that may result from disposition of the pending lawsuits and arbitrations. In November 2014, the Company received a notice from the United States Environmental Protection Agency (EPA) requesting information under the Clean Water Act related to the discharge of crude oil as a result of a derailment of an Alabama & Gulf Coast Railway LLC (AGR) freight train in November 2013 in the vicinity of Aliceville, Alabama. In May 2018, the EPA notified the AGR of a maximum civil payment of up to $14.1 million, based on the amount of oil allegedly discharged and other relevant factors considered under the applicable regulation. The Company is evaluating its defenses, settlement options and the availability of insurance. The Company is also involved in several arbitrations related to contractual disputes that are not covered by insurance. In March 2017, CSX Transportation, Inc. (CSXT) initiated arbitration against several of the Company’s subsidiaries associated with freight revenue factors (or divisions) under certain operating agreements associated with leased railroads. CSXT is seeking to reduce certain of the Company's freight revenue factors for the time period after August 21, 2016. While the arbitration is not complete, the arbitration panel issued a Partial Final Award dated July 19, 2018 denying CSXT’s request that the freight revenue factors at issue be reduced. The Company continues to believe that it has meritorious defenses against CSXT’s remaining claims. In an unrelated matter, on May 3, 2017, the AGR initiated arbitration related to the collection of approximately $13 million of outstanding liquidated damages under a volume commitment (or take-or-pay) contract with a customer. The Company believes it will prevail in the collection of the outstanding liquidated damages. Although the Company expects to attain successful outcomes in each of these matters, arbitration is inherently uncertain, and it is possible that an unfavorable ruling could have an adverse effect on the Company's results of operations, financial condition and liquidity.

COMMITMENTS AND CONTINGENCIES:

From time to time, the Company is a defendant in certain lawsuits and a party to certain arbitrations resulting from the Company's operations in the ordinary course as the nature of the Company's business exposes it to the potential for various claims and litigation, including those related to property damage, personal injury, freight loss, labor and employment, environmental and other matters. The Company maintains insurance policies to mitigate the financial risk associated with such claims. However, any material changes to pending litigation or a catastrophic rail accident or series of accidents involving material freight loss or property damage, personal injuries or environmental liability or other claims or disputes that are not covered by insurance could have a material adverse effect on the Company's results of operations, financial condition and liquidity. Management believes there are adequate provisions in the financial statements for any probable liabilities that may result from disposition of the pending lawsuits and arbitrations.

In November 2014, the Company received a notice from the United States Environmental Protection Agency (EPA) requesting information under the Clean Water Act related to the discharge of crude oil as a result of a derailment of an Alabama & Gulf Coast Railway LLC (AGR) freight train in November 2013 in the vicinity of Aliceville, Alabama. In May 2018, the EPA notified the AGR of a maximum civil payment of up to $14.1 million, based on the amount of oil allegedly discharged and other relevant factors considered under the applicable regulation. The Company is evaluating its defenses, settlement options and the availability of insurance.

The Company is also involved in several arbitrations related to contractual disputes that are not covered by insurance. In March 2017, CSX Transportation, Inc. (CSXT) initiated arbitration against several of the Company’s subsidiaries associated with freight revenue factors (or divisions) under certain operating agreements associated with leased railroads. CSXT is seeking to reduce certain of the Company's freight revenue factors for the time period after August 21, 2016. While the arbitration is not complete, the arbitration panel issued a Partial Final Award dated July 19, 2018 denying CSXT’s request that the freight revenue factors at issue be reduced. The Company continues to believe that it has meritorious defenses against CSXT’s remaining claims. In an unrelated matter, on May 3, 2017, the AGR initiated arbitration related to the collection of approximately $13 million of outstanding liquidated damages under a volume commitment (or take-or-pay) contract with a customer. The Company believes it will prevail in the collection of the outstanding liquidated damages. Although the Company expects to attain successful outcomes in each of these matters, arbitration is inherently uncertain, and it is possible that an unfavorable ruling could have an adverse effect on the Company's results of operations, financial condition and liquidity.