Notes Receivable	6 Months Ended
Notes Receivable	Jun. 30, 2018
Notes Receivable [Abstract]
Notes Receivable	(4)Notes Receivable Notes receivable consist of a commitment from the seller of an oil and gas property acquired by the Company related to costs associated with the abandonment of the acquired property. Pursuant to an agreement with the seller, the Company will invoice the seller an agreed upon amount at the completion of certain decommissioning activities. The gross amount of this obligation totals $115.0 million and is recorded at present value using an effective interest rate of 6.58%. The related discount is amortized to interest income based on the expected timing of completion of the decommissioning activities. The Company recorded interest income related to notes receivable of $1.9 million and $1.7 million for the six months ended June 30, 2018 and 2017, 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.