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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2012
Operating Loss Carryforwards [Line Items] |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The difference between the actual income tax expense and the tax expense computed by applying the statutory federal income tax rate to income before income taxes is attributable to the following (in thousands):
|  | Year Ended December 31,
|  | 2012 |  | 2011 |  | 2010
Provision for federal income taxes at statutory rate |  | $ | 4,047 |  |  | $ | 6,304 |  |  | $ | 5,316 |
State income taxes, net of federal tax provision |  | (58 | ) |  | 255 |  |  | 32 |
Valuation allowance |  | 193 |  |  | (1,145 | ) |  | — |
Permanent differences |  | 300 |  |  | 15 |  |  | (218 | )
Conversion to partnership |  | (18,534 | ) |  | — |  |  | — |
Other items |  | 28 |  |  | (66 | ) |  | (28 | )
Income tax (benefit) expense |  | $ | (14,024 | ) |  | $ | 5,363 |  |  | $ | 5,102 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | Income tax expense is as follows (in thousands):
|  | Year Ended December 31,
|  | 2012 |  | 2011 |  | 2010
Current |  | $ | 4,738 |  |  | $ | 9,691 |  |  | $ | 4,844 |
Deferred |  | (18,762 | ) |  | (4,328 | ) |  | 258 |
|  | $ | (14,024 | ) |  | $ | 5,363 |  |  | $ | 5,102 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | Significant components of our deferred tax assets and liabilities, reported separately in the accompanying combined financial statements, as of December 31, 2012 and 2011, are as follows (in thousands):
|  | December 31,
|  | 2012 |  | 2011
Current Deferred Taxes: |  |  |  |
Accrued reserves |  | $ | 1 |  |  | $ | 60 |
Tank and pipeline inspection liabilities |  | 2 |  |  | 113 |
Contingent liabilities |  | 11 |  |  | 632 |
Valuation allowance |  | — |  |  | (72 | )
Total current deferred tax assets |  | 14 |  |  | 733 |
Non-Current Deferred Taxes: |  |  |  |
Depreciation and amortization |  | (36 | ) |  | (17,011 | )
Net operating loss carryforwards |  | — |  |  | 626 |
Stock-based compensation |  | — |  |  | 237 |
Asset retirement obligations |  | 1 |  |  | 280 |
ASC 815 derivatives |  | — |  |  | (6 | )
Deferred revenue |  | — |  |  | 343 |
Tank and pipeline inspection liabilities |  | 6 |  |  | 1,145 |
Contingent liabilities |  | 13 |  |  | 1,684 |
State bonus depreciation |  | — |  |  | 129 |
Other |  | (1 | ) |  | (11 | )
Valuation allowance |  | — |  |  | (6,914 | )
Total non-current deferred tax liabilities |  | (17 | ) |  | (19,498 | )
Total net deferred tax liabilities |  | $ | (3 | ) |  | $ | (18,765 | )

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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