Income Taxes (Tables)
|
12 Months Ended |
Dec. 31, 2018 |
Income Taxes [Abstract] |
|
Provision for Income Taxes |
|
|
|
|
|
|
|
|
|
|
|
|
Year Ended December 31,
|
(in thousands)
|
|
2018
|
|
2017
|
|
2016
|
U.S. Federal:
|
|
|
|
|
|
|
|
|
|
Current
|
|
$
|
(674)
|
|
$
|
—
|
|
$
|
—
|
Deferred
|
|
|
(15,910)
|
|
|
(1,260)
|
|
|
—
|
Foreign:
|
|
|
|
|
|
|
|
|
|
Current
|
|
|
14,327
|
|
|
11,638
|
|
|
9,248
|
Deferred
|
|
|
(40,997)
|
|
|
—
|
|
|
—
|
Total
|
|
$
|
(43,254)
|
|
$
|
10,378
|
|
$
|
9,248
|
|
|
|
|
|
|
|
|
|
|
|
Summary of Differences between the Financial Statement and Tax Bases of Assets and Liabilities |
|
|
|
|
|
|
|
|
|
As of December 31,
|
(in thousands)
|
|
2018
|
|
2017
|
Deferred tax assets:
|
|
|
|
|
|
|
Basis difference in fixed assets
|
|
$
|
38,479
|
|
$
|
46,929
|
Foreign tax credit carryforward
|
|
|
43,760
|
|
|
48,071
|
Alternative minimum tax credit carryover
|
|
|
674
|
|
|
1,349
|
U.S. federal net operating losses
|
|
|
20,616
|
|
|
22,490
|
Foreign net operating losses
|
|
|
19,989
|
|
|
26,371
|
Asset retirement obligations
|
|
|
3,111
|
|
|
4,234
|
Basis difference in accrued liabilities
|
|
|
3,816
|
|
|
3,716
|
Basis difference in receivables
|
|
|
387
|
|
|
1,331
|
Other
|
|
|
180
|
|
|
(26)
|
Total deferred tax assets
|
|
|
131,012
|
|
|
154,465
|
Valuation allowance
|
|
|
(90,935)
|
|
|
(153,205)
|
Net deferred tax assets
|
|
$
|
40,077
|
|
$
|
1,260
|
|
|
|
|
|
|
|
|
Pretax Income |
|
|
|
|
|
|
|
|
|
|
|
|
Year Ended December 31,
|
(in thousands)
|
|
2018
|
|
2017
|
|
2016
|
U.S.
|
|
$
|
(5,672)
|
|
$
|
(9,453)
|
|
$
|
(9,893)
|
Foreign
|
|
|
61,146
|
|
|
30,103
|
|
|
874
|
|
|
$
|
55,474
|
|
$
|
20,650
|
|
$
|
(9,019)
|
|
Statutory Rate Reconciliation |
|
|
|
|
|
|
|
|
|
|
|
|
Year Ended December 31,
|
(in thousands)
|
|
2018
|
|
2017
|
|
2016
|
Tax provision computed at U.S. statutory rate
|
|
$
|
11,650
|
|
$
|
7,228
|
|
$
|
(3,156)
|
Foreign taxes not offset in U.S. by foreign tax credits
|
|
|
24,840
|
|
|
6,775
|
|
|
6,319
|
Impact of Tax Reform Act
|
|
|
—
|
|
|
52,449
|
|
|
—
|
Recognition of foreign deferred tax assets, net of U.S. impact
|
|
|
(45,751)
|
|
|
—
|
|
|
—
|
Unrealizable foreign deferred tax assets
|
|
|
24,176
|
|
|
|
|
|
|
Effect of change in foreign statutory rates
|
|
|
—
|
|
|
—
|
|
|
2,394
|
Permanent differences
|
|
|
(104)
|
|
|
309
|
|
|
4,505
|
Foreign tax credit expirations
|
|
|
4,311
|
|
|
2,394
|
|
|
—
|
Increase/(decrease) in valuation allowance
|
|
|
(62,270)
|
|
|
(58,777)
|
|
|
(802)
|
Other
|
|
|
(106)
|
|
|
—
|
|
|
(12)
|
Total income tax expense (benefit)
|
|
$
|
(43,254)
|
|
$
|
10,378
|
|
$
|
9,248
|
|
|
|
|
|
|
|
|
|
|
|
Income Tax Years Subject to Examination by Major Tax Jurisdictions |
|
|
|
|
|
|
Jurisdiction
|
|
Years
|
U.S.
|
|
2009-2018
|
Gabon
|
|
2014-2018
|
|