Equity Method Investments (Narrative) (Details) $ in Thousands		3 Months Ended	9 Months Ended
	Oct. 07, 2019 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($) item	Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Investments in and advances to affiliated companies			$ 271,655	$ 268,322
Number of joint ventures | item			3
Other Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Investments in and advances to affiliated companies			$ 16,191
LNG Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Investments in and advances to affiliated companies			120,415
Unrealized losses with interest rate swap			21,000
LNG Joint Venture [Member] | Subsequent Event [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.90%
Proceeds from divestiture of interest in joint venture	$ 123,000
LNG Joint Venture [Member] | Scenario, Forecast
Schedule of Equity Method Investments [Line Items]
Gain on sale of equity method investment		$ 3,000
FSO Joint Venture [Member] | FSO Asia and FSO Africa [Member]
Schedule of Equity Method Investments [Line Items]
Investments in and advances to affiliated companies			$ 135,049
LNG Joint Venture, TI Africa and TI Asia Limited [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage			50.00%
Equity Method Investee [Member] | FSO Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Guarantor obligations, maximum exposure, undiscounted			$ 77,065	93,548
Guarantor obligations, current carrying value			$ 349	$ 673