The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Name:	us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Fair Value Measurements, Nonrecurring (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value Measurements (Textual)
Asset impairment loss		$ 0	$ 0	$ 56,000,000
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements (Textual)
Assets measured at fair value, nonrecurring		0	0
Liabilities measured at fair value, nonrecurring		$ 0	$ 0
Aruba Terminal [Member]
Fair Value Measurements (Textual)
Asset impairment loss	$ 56,000,000