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Related-Party Transactions	9 Months Ended
Related-Party Transactions	Sep. 30, 2018
Related Party Transactions [Abstract]
Related-Party Transactions	Related-Party Transactions Deferred Compensation In July 2017, the Company’s board of directors elected to terminate the Company’s deferred compensation plans. In accordance with applicable regulations, distribution of the assets and settlement of the deferred compensation obligation was made to the participants in July 2018. In June 2018, the Company completed the sale of the legal entities used in the oil and gas business to its former service agent. There was no material gain or loss on the transaction. In connection with the execution of a transition agreement with the Company’s current Chief Financial Officer, $748,000 of severance benefits were accrued during the three months ended September 30, 2018.