Income Taxes (Tables)
|
12 Months Ended |
Dec. 31, 2017 |
Income Taxes [Abstract] |
|
Provision for Income Taxes |
|
|
|
|
|
|
|
|
|
|
|
|
Year Ended December 31,
|
(in thousands)
|
|
2017
|
|
2016
|
|
2015
|
U.S. Federal:
|
|
|
|
|
|
|
|
|
|
Current
|
|
$
|
—
|
|
$
|
—
|
|
$
|
—
|
Deferred
|
|
|
(1,260)
|
|
|
—
|
|
|
1,349
|
Foreign:
|
|
|
|
|
|
|
|
|
|
Current
|
|
|
11,638
|
|
|
9,248
|
|
|
13,238
|
Deferred
|
|
|
—
|
|
|
—
|
|
|
—
|
Total
|
|
$
|
10,378
|
|
$
|
9,248
|
|
$
|
14,587
|
|
|
|
|
|
|
|
|
|
|
|
Summary of Differences between the Financial Statement and Tax Bases of Assets and Liabilities |
|
|
|
|
|
|
|
|
|
As of December 31,
|
(in thousands)
|
|
2017
|
|
2016
|
Deferred tax assets:
|
|
|
|
|
|
|
Basis difference in fixed assets
|
|
$
|
46,929
|
|
$
|
89,016
|
Foreign tax credit carryforward
|
|
|
48,071
|
|
|
50,339
|
Alternative minimum tax credit carryover
|
|
|
1,349
|
|
|
1,349
|
U.S. federal net operating losses
|
|
|
22,490
|
|
|
30,230
|
Foreign net operating losses
|
|
|
26,371
|
|
|
25,543
|
Asset retirement obligations
|
|
|
4,234
|
|
|
6,514
|
Basis difference in receivables
|
|
|
1,331
|
|
|
1,824
|
Other
|
|
|
3,690
|
|
|
6,952
|
Total deferred tax assets
|
|
|
154,465
|
|
|
211,767
|
Valuation allowance
|
|
|
(153,205)
|
|
|
(211,767)
|
Net deferred tax assets
|
|
$
|
1,260
|
|
$
|
—
|
|
|
|
|
|
|
|
|
Pretax Income |
|
|
|
|
|
|
|
|
|
|
|
|
Year Ended December 31,
|
(in thousands)
|
|
2017
|
|
2016
|
|
2015
|
United States
|
|
$
|
(9,453)
|
|
$
|
(9,893)
|
|
$
|
(15,177)
|
Foreign
|
|
|
30,103
|
|
|
874
|
|
|
(90,790)
|
|
|
$
|
20,650
|
|
$
|
(9,019)
|
|
$
|
(105,967)
|
|
Statutory Rate Reconciliation |
|
|
|
|
|
|
|
|
|
|
|
|
Year Ended December 31,
|
(in thousands)
|
|
2017
|
|
2016
|
|
2015
|
Tax provision computed at U.S. statutory rate
|
|
$
|
7,228
|
|
$
|
(3,156)
|
|
$
|
(37,089)
|
Foreign taxes not offset in U.S. by foreign tax credits
|
|
|
6,775
|
|
|
6,319
|
|
|
(394)
|
Impact of Tax Reform Act
|
|
|
52,449
|
|
|
—
|
|
|
—
|
Effect of change in foreign statutory rates
|
|
|
—
|
|
|
2,394
|
|
|
3,014
|
Permanent differences
|
|
|
309
|
|
|
4,505
|
|
|
1,803
|
Foreign tax credit adjustments
|
|
|
2,394
|
|
|
—
|
|
|
—
|
Increase/(decrease) in valuation allowance
|
|
|
(58,777)
|
|
|
(802)
|
|
|
47,253
|
Other
|
|
|
—
|
|
|
(12)
|
|
|
—
|
Total income tax expense
|
|
$
|
10,378
|
|
$
|
9,248
|
|
$
|
14,587
|
|
|
|
|
|
|
|
|
|
|
|
Income Tax Years Subject to Examination by Major Tax Jurisdictions |
|
|
|
|
|
|
Jurisdiction
|
|
Years
|
United States
|
|
2008-2017
|
Gabon
|
|
2013-2017
|
|