Claim Settlement Receivable	12 Months Ended
Claim Settlement Receivable	Dec. 31, 2018
Claim Settlement Receivable
Claim Settlement Receivable	6. Claim Settlement Receivable On March 24, 2016, the Company entered into a full and final release agreement with BP p.l.c. and various related entities pursuant to which the Company, on its own behalf and on behalf of certain wholly owned subsidiaries, released any and all claims related to the Deepwater Horizon oil spill, which occurred on April 20, 2010. In exchange for this release, the Company will receive $13.2 million, from BP Exploration & Production Inc., a large portion of which will reimburse the Company for expenses incurred. In both October 2018 and 2017, the Company received a payment of $2.7 million and in October 2016 the Company received a payment of $5.0 million. The remaining settlement amount of $2.7 million is due in October 2019. The Company also received a guaranty of payments from BP North America Corporation Inc. As of March 24, 2016, the Company recorded the claim settlement receivable using an imputed interest rate of 3.0%, based on its best estimate of the prevailing market rates for the source of credit, resulting in an initial present value of $12.5 million and a discount of $0.7 million. The claim settlement of $12.5 million was recognized as other income in the Company’s consolidated statements of income for the year ended December 31, 2016. The discount is being accreted over the term of the receivable using the effective interest method. Interest income for the years ended December 31, 2018 and 2017 and the period from March 24, 2016 to December 31, 2016 was $0.1 million, $0.2 million and $0.3 million, respectively.

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.