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Related-Party Transactions	6 Months Ended
Related-Party Transactions	Jun. 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. Consequently, while participant compensation remained deferred at June 30, 2018, the plans are no longer active. In accordance with applicable regulations, distribution of the remaining assets and settlement of the deferred compensation obligation was made to the participants in July 2018. The total value of the deferred compensation obligation for all participants was $4.2 million at June 30, 2018 and $4.1 million at December 31, 2017. 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.