Significant Accounting Policies and Practices (Details)			3 Months Ended			12 Months Ended
		Aug. 25, 2017 Inch	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jul. 31, 2018 mi	Dec. 31, 2015 USD ($)
Accounting Policies [Line Items]
Operating expenses	[1]					$ 128,337,000	$ 140,177,000	$ 152,325,000
Cost of products sold						$ 684,610,000	620,277,000	478,193,000
Goodwill and Other Intangibles
Number of reporting units | segment						4
Impairment of goodwill						$ 0	0	4,145,000
Impairment of intangible assets						0	0	0
Debt Issuance Costs
Debt issuance cost						1,312,000	66,000	5,274,000
Amortization of debt issuance costs						3,445,000	2,897,000	3,684,000
Accumulated amortization of debt issuance costs			$ 17,162,000			20,607,000	17,162,000
Impairment of Long-Lived Assets
Impairment of long-lived assets						0	2,225,000	26,953,000
Indirect Selling, General and Administrative Expenses
Indirect selling, general and administrative expenses						$ 16,416,000	16,416,000	13,033,000
Minimum
Deferred Catalyst Costs
Catalyst, useful life (in months)						12 months
Deferred Turnaround Costs
Turnarounds, useful life (in months)						12 months
Maximum
Deferred Catalyst Costs
Catalyst, useful life (in months)						36 months
Deferred Turnaround Costs
Turnarounds, useful life (in months)						36 months
Terminalling and storage
Impairment of Long-Lived Assets
Impairment of long-lived assets			600,000					15,252,000
Marine transportation
Goodwill and Other Intangibles
Impairment of goodwill								4,145,000
Impairment of Long-Lived Assets
Impairment of long-lived assets			$ 1,625,000		$ 11,701,000
Revolving Loan Facility
Debt Issuance Costs
Face amount					$ 664,444,000	$ 664,444,000		664,444,000		$ 700,000,000
Write off of existing debt issuance costs								820,000
Hurricane Harvey
Impairment of Long-Lived Assets
Impairment of long-lived assets				$ 186,000
Inches of rain produced | Inch		50
Discontinued Operations, Disposed of by Sale | WTLPG
Accounting Policies [Line Items]
Ownership percentage									20.00%
Length common carrier pipeline (in miles) | mi									2,300
Previously Reported | Reclassification Of Certain Terminalling And Storage Product Expenses
Accounting Policies [Line Items]
Operating expenses							146,874,000	158,864,000
Cost of products sold							$ 613,580,000	$ 471,654,000

[1] *Related Party Transactions Included Above   Year Ended December 31,   2018   2017   2016 Revenues:           Terminalling and storage $ 79,219
  $ 82,205
  $ 82,437
Marine transportation 15,442
  16,801
  21,767
Natural gas services —
  122
  699
Product sales 1,407
  3,578
  3,034
Costs and expenses:  
   
   
Cost of products sold: (excluding depreciation and amortization)  
   
   
Natural gas services 14,816
  18,946
  22,886
Sulfur services 17,418
  15,564
  15,339
          Terminalling and storage 28,304
  17,612
  13,838
Expenses:  
   
   
Operating expenses 55,528
  64,344
  70,841
Selling, general and administrative 28,246
  29,416
  25,890