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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	(16) Related Party Transactions The Company is a 50% owner of The Hollywood Camp, L.L.C. (“The Hollywood Camp”), a company that owns and operates a hunting and fishing facility used by the Company primarily for customer entertainment. The Hollywood Camp allocates lease and lodging expenses to its members based on their usage of the facilities. The Company paid The Hollywood Camp $3,634,000 in 2017, $3,143,000 in 2016 and $2,830,000 in 2015 for its share of facility expenses. The Company is a 50% owner of Bolivar Terminal Co., Inc. (“Bolivar”), a company that provides barge fleeting services (temporary barge storage facilities) in the Houston, Texas area. The Company paid Bolivar $581,000 in 2017, $1,314,000 in 2016 and $895,000 in 2015 for barge fleeting services. Such services were in the ordinary course of business of the Company. The husband of Amy D. Husted, Vice President and General Counsel of the Company, is a partner in the law firm of Strasburger & Price, LLP. The Company paid the law firm $830,000 in 2017, $779,000 in 2016 and $596,000 in 2015 for legal services in connection with matters in the ordinary course of business of the Company.