Commitments and Contingencies

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies

Commitments and Contingencies

13.  Commitments and Contingencies

The Texas Legislature enacted changes related to the appraisal of natural gas compressors for ad valorem taxes by expanding the definitions of “Heavy Equipment Dealer” and “Heavy Equipment.” Under the revised statute, we believe we are a Heavy Equipment Dealer and that our natural gas compressors are Heavy Equipment and are, therefore, required to file the 2012 property tax renditions under this new methodology. As a result of filing as a Heavy Equipment Dealer in Texas counties, a number of Appraisal Review Boards have denied our position and we are currently filing petitions for review in district courts.

As a result of the new methodology, our ad valorem tax expense (which is reflected on our consolidated statements of operations as a component of Cost of goods sold (excluding depreciation and amortization expense)) includes a benefit of $4.3 million, of which approximately $0.8 million has been agreed to by a number of Appraisal Review Boards, for the year ended December 31, 2012.

We are subject to a number of state and local taxes that are not income-based. Many of these taxes are subject to audit by the taxing authorities, and therefore, it is possible that an audit could result in our making additional tax payments. We accrue for such additional tax payments resulting from an audit when we determine that it is probable that we have incurred a liability and we can reasonably estimate the amount of the liability. We do not believe that such payments would be material to our consolidated financial position but cannot provide assurance that the resolution of an audit would not be material to our results of operations or cash flows for the period in which the resolution occurs.

In the ordinary course of business, we are involved in various pending or threatened legal actions. While management is unable to predict the ultimate outcome of these actions, we believe that any ultimate liability arising from these actions will not have a material adverse effect on our consolidated financial position, results of operations or cash flows. Because of the inherent uncertainty of litigation, however, we cannot provide assurance that the resolution of any particular claim or proceeding to which we are a party will not have a material adverse effect on our consolidated financial position, results of operations or cash flows, including our ability to make cash distributions to our unitholders, for the period in which the resolution occurs.