Commitments and Contingencies

6 Months Ended

Jun. 30, 2013

Commitments and Contingencies

Commitments and Contingencies

12.  Commitments and Contingencies

The Texas Legislature enacted changes related to the appraisal of natural gas compressors for ad valorem tax purposes by expanding the definitions of “Heavy Equipment Dealer” and “Heavy Equipment” effective from the beginning of 2012. Under the revised statute, we believe we are a Heavy Equipment Dealer and that our natural gas compressors are Heavy Equipment and, therefore, are required to file our ad valorem tax renditions under this new methodology. As a result of filing as a Heavy Equipment Dealer in Texas counties, a large number of appraisal review boards have denied our position, and we have filed petitions for review in the appropriate district courts. The first of these cases is presently scheduled to commence in September 2013.

As a result of the new methodology, our ad valorem tax expense (which is reflected on our condensed consolidated statements of operations as a component of cost of sales (excluding depreciation and amortization expense)) includes a benefit of $2.9 million during the six months ended June 30, 2013. Since the change in methodology became effective in 2012, we have recorded an aggregate benefit of $7.2 million as of June 30, 2013, of which approximately $1.3 million has been agreed to by a number of appraisal review boards and county appraisal districts. If we are unsuccessful in any of the cases with the appraisal districts, the additional ad valorem tax payments may also be subject to penalties and interest.

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 us 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, it believes that any ultimate liability arising from any of these actions 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. However, because of the inherent uncertainty of litigation, 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.