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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2015
Income Tax Disclosure [Abstract] |
Summary of provision for (benefit from) income taxes | The provision for (benefit from) income taxes consisted of the following (in thousands):
| Years Ended December 31,
| 2015 |  | 2014 |  | 2013
Current tax provision (benefit): |  |  |  |  |  |  |  |
U.S. federal | $ | 556 |  |  | $ | 23 |  |  | $ | (310 | )
State | 1,415 |  |  | (654 | ) |  | 938 |
Total current | 1,971 |  |  | (631 | ) |  | 628 |
Deferred tax provision (benefit): |  |  |  |  |  |  |  |
U.S. federal | 48,450 |  |  | (23,786 | ) |  | (18,397 | )
State | 2,768 |  |  | (3,649 | ) |  | (71 | )
Total deferred | 51,218 |  |  | (27,435 | ) |  | (18,468 | )
Provision for (benefit from) income taxes | $ | 53,189 |  |  | $ | (28,066 | ) |  | $ | (17,840 | )
Reconciliation of effective tax rate and U.S. statutory rate. | The reasons for the differences between these effective tax rates and the U.S. statutory rate of 35% are as follows (in thousands):
| Years Ended December 31,
| 2015 |  | 2014 |  | 2013
Income taxes at U.S. federal statutory rate of 35% | $ | (37,165 | ) |  | $ | (15,813 | ) |  | $ | (7,311 | )
Net state income taxes | 2,383 |  |  | (5,253 | ) |  | 937 |
Noncontrolling interest | (2,904 | ) |  | (11,166 | ) |  | (12,685 | )
Unrecognized tax benefits | 698 |  |  | 4,063 |  |  | 416 |
Valuation allowances and write off of tax attributes | 88,088 |  |  | — |  |  | — |
Other | 2,089 |  |  | 103 |  |  | 803 |
Provision for (benefit from) income taxes | $ | 53,189 |  |  | $ | (28,066 | ) |  | $ | (17,840 | )
Tax effects of deferred tax assets and deferred tax liabilities | The tax effects of temporary differences that give rise to deferred tax assets and deferred tax liabilities are as follows (in thousands):
| December 31,
| 2015 |  | 2014
Deferred tax assets: |  |  |  |  |
Net operating loss carryforwards | $ | 8,028 |  |  | $ | 37,668 |
Inventory | 3,642 |  |  | 4,405 |
Alternative minimum tax credit carryforwards | 1,496 |  |  | 5,685 |
Accrued liabilities | 11,466 |  |  | 7,894 |
Other | 4,913 |  |  | — |
Subtotal | 29,545 |  |  | 55,652 |
Valuation allowances | (633 | ) |  | (633 | )
Total deferred tax assets | 28,912 |  |  | 55,019 |
Deferred tax liabilities: |  |  |  |  |
Property, plant and equipment | (53,495 | ) |  | (126,670 | )
Basis difference in the Partnership | (148,421 | ) |  | (136,438 | )
Other | (5,562 | ) |  | (10,583 | )
Total deferred tax liabilities | (207,478 | ) |  | (273,691 | )
Net deferred tax liabilities | $ | (178,566 | ) |  | $ | (218,672 | )
Reconciliation of beginning and ending amount of unrecognized tax benefits | A reconciliation of the beginning and ending amount of unrecognized tax benefits (including discontinued operations) is shown below (in thousands):
| Years Ended December 31,
| 2015 |  | 2014 |  | 2013
Beginning balance | $ | 14,595 |  |  | $ | 11,259 |  |  | $ | 9,597 |
Additions based on tax positions related to current year | 845 |  |  | 954 |  |  | 365 |
Additions based on tax positions related to prior years | 3,648 |  |  | 2,597 |  |  | 1,710 |
Reductions based on settlement with government authority | — |  |  | — |  |  | — |
Reductions based on lapse of statute of limitations | — |  |  | (215 | ) |  | (97 | )
Reductions based on tax positions related to prior years | (592 | ) |  | — |  |  | (316 | )
Reductions based on tax positions transferred to Exterran Corp. | (6,498 | ) |  | $ | — |  |  | $ | — |
Ending balance | $ | 11,998 |  |  | $ | 14,595 |  |  | $ | 11,259 |

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