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Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2019
Financial Instruments And Fair Value Disclosures [Abstract]  
Fair Value of Financial Assets and Liabilities The tables below summarize the balances of derivative assets and liabilities at September 30, 2019 and December 31, 2018 (in thousands):
 
September 30, 2019
 
Level 1
 
Level 2
 
Level 3
 
Netting (1)
 
Total - Net
Assets:
 
 
 
 
 
 
 
 
 
Commodity derivatives (2)
$
4,790

 
$
—

 
$
—

 
$
(84
)
 
$
4,706

Total assets
4,790

 
—

 
—

 
(84
)
 
4,706

Liabilities:
 
 
 
 
 
 
 
 
 
Commodity derivatives (2)
84

 
—

 
—

 
(84
)
 
—

Interest rate swaps
—

 
—

 
3,619

 
—

 
3,619

Total liabilities
84

 
—

 
3,619

 
(84
)
 
3,619

Net assets (liabilities) at fair value
$
4,706

 
$
—

 
$
(3,619
)
 
$
—

 
$
1,087

 
 
 
 
 
 
 
 
 
 
 
December 31, 2018
 
Level 1
 
Level 2
 
Level 3
 
Netting (1)
 
Total - Net
Assets:
 
 
 
 
 
 
 
 
 
Commodity derivatives (2)
$
4,658

 
$
—

 
$
—

 
$
(973
)
 
$
3,685

Total assets
4,658

 
—

 
—

 
(973
)
 
3,685

Liabilities:
 
 
 
 
 
 
 
 
 
Commodity derivatives (2)
973

 
—

 
—

 
(973
)
 
—

Foreign currency forwards
—

 
2,985

 
—

 
—

 
2,985

Interest rate swaps
—

 
—

 
1,482

 
—

 
1,482

Total liabilities
973

 
2,985

 
1,482

 
(973
)
 
4,467

Net assets (liabilities) at fair value
$
3,685

 
$
(2,985
)
 
$
(1,482
)
 
$
—

 
$
(782
)
(1) Commodity derivatives are subject to netting arrangements.
(2) Relates primarily to exchange traded futures. Gain and loss positions on multiple contracts are settled net on a daily basis with the exchange.
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
The following table summarizes changes in the fair value of our net financial liabilities classified as Level 3 in the fair value hierarchy (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Net assets (liabilities) at beginning of the period
$
(3,676
)
 
$
110

 
$
(1,482
)

$
(1,228
)
Transfers out of Level 3
—

 
—

 
—


—

Realized/Unrealized gain (loss) included in earnings*
31

 
268

 
(2,163
)

1,487

Settlements
26

 
(224
)
 
26


(105
)
Net assets (liabilities) at end of period
$
(3,619
)
 
$
154

 
$
(3,619
)

$
154

*Gains and losses related to interest rate swaps are recorded in interest expense in the condensed consolidated statements of operations and comprehensive income (loss).
Schedule of Notional Quantities for Commodity Derivative Instruments
The following table sets forth the notional quantities for derivative instruments entered into (in thousands of barrels):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Sales
3,406

 
2,704

 
12,514

 
10,467

Purchases
3,243

 
2,701

 
12,268

 
9,892
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] We have recorded the fair value of our commodity derivative instruments on our condensed consolidated balance sheets in “other current assets” and “other current liabilities” in the following amounts (in thousands):
 
September 30, 2019
 
December 31, 2018
 
Assets
 
Liabilities
 
Assets
 
Liabilities
Commodity contracts
$
4,706

 
$
—

 
$
3,685

 
$
—
Schedule of Realized and Unrealized Gains (Losses) from Commodity Derivatives
Realized and unrealized gains (losses) from our commodity derivatives were recorded to product revenue in the following amounts (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Commodity contracts
$
4,315

 
$
(1,247
)
 
$
(3,405
)
 
$
(13,477
)