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Revenue (Tables)
 6 Months Ended
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]  
Change in Contract with Customer, Asset and Liability Changes in our contract balances during the period are as follows:
(in thousands of $)
Contract assets (1)
Contract liabilities (2)
Opening balance on January 1, 2019
24,376

(31,296
)
Payments received for services billed
(19,937
)
—

Services provided and billed in current period
112,845

—

Payments received for services billed in current period
(93,475
)
—

Deferred commissioning period revenue
—

2,110

Closing balance on June 30, 2019
23,809

(29,186
)
(1) Relates to management fee revenue and liquefaction services revenue, see a) and b) below.
(2) Relates to liquefaction services revenue, see b) below.
Disaggregation of Revenue Liquefaction services revenue recognized comprises the following amounts:
 
Six months ended June 30,
(in thousands of $)
2019

2018

Base tolling fee (1)
102,250

17,427

Amortization of deferred commissioning period billing (2)
2,110

357

Amortization of Day 1 gain (3)
4,975

841

Other
(287
)
(48
)
Total
109,048

18,577

(1) The LTA bills at a base rate in periods when the oil price is $60 or less per barrel (included in "Liquefaction services revenue" in the consolidated statements of income), and at an increased rate when the oil price is greater than $60 per barrel (recognized as a derivative and included in "Realized and unrealized gain on oil derivative instrument" in the consolidated statements of income, excluded from revenue and from the transaction price).
(2) Customer billing during the commissioning period, prior to vessel acceptance and commencement of the contract term, of $33.8 million is considered an upfront payment for services. These amounts billed are deferred (included in "Other current liabilities" and "Other non-current liabilities" in the consolidated balance sheets) and recognized as part of "Liquefaction services revenue" in the consolidated statements of income evenly over the contract term.
(3) The Day 1 gain was established when the oil derivative asset was initially recognized in December 2017 for $79.6 million (recognized in "Other current liabilities" and "Other non-current liabilities" in the consolidated balance sheets). This amount is amortized and recognized as part of "Liquefaction services revenue" in the consolidated statements of income evenly over the contract term.