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SIGNIFICANT ACCOUNTING POLICIES
12 Months Ended
Dec. 31, 2011
SIGNIFICANT ACCOUNTING POLICIES [Abstract]  
SIGNIFICANT ACCOUNTING POLICIES
(2) 
SIGNIFICANT ACCOUNTING POLICIES
 
(a)       Principles of Presentation and Consolidation
 
The consolidated financial statements include the financial statements of the Partnership and its wholly-owned subsidiaries and equity method investees.  In the opinion of the management of the Partnership's general partner, all adjustments and elimination of significant intercompany balances necessary for a fair presentation of the Partnership's results of operations, financial position and cash flows for the periods shown have been made.  All such adjustments are of a normal recurring nature.  In addition, the Partnership evaluates its relationships with other entities to identify whether they are variable interest entities under certain provisions of the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”), 810-10 and to assess whether it is the primary beneficiary of such entities.  If the determination is made that the Partnership is the primary beneficiary, then that entity is included in the consolidated financial statements in accordance with ASC 810-10.  No such variable interest entities exist as of December 31, 2011 or 2010.

The Partnership acquired the assets of Cross Oil Refining & Marketing Inc. (“Cross”) from Martin Resource in November 2009.  The acquisition of the Cross assets was considered a transfer of net assets between entities under common control.  The acquisition of the Cross assets and increase in partners' capital for the common and subordinated units issued in November 2009 are recorded at amounts based on the historical carrying value of the Cross assets at that date, and the Partnership is required to revise its historical financial statements to include the activities of the Cross assets as of the date of common control.  Martin Resource Management acquired Cross in November 2006; however, the activity for the period Cross was owned by Martin Resource Management during 2006 was not considered significant to the Partnership's consolidated financial statements and has been excluded from the consolidated financial statements.  The Partnership's accompanying historical financial statements for the period January 1, 2009 through November 24, 2009 have been revised to reflect the financial position, cash flows and results of operations attributable to the Cross assets as if the Partnership owned the Cross assets for these periods.  Net income attributable to the Cross assets for periods prior to the Partnership's acquisition of the assets is not allocated to the general and limited partners for purposes of calculating net income per limited partner unit.  See Note (2)(o).
 
(b)       Product Exchanges
 
The Partnership enters into product exchange agreements with third parties, whereby the Partnership agrees to exchange NGLs and sulfur with third parties.  The Partnership records the balance of exchange products due to other companies under these agreements at quoted market product prices and the balance of exchange products due from other companies at the lower of cost or market.  Cost is determined using the first-in, first-out (“FIFO”) method.  Revenue and costs related to product exchanges are recorded on a gross basis.
 
(c)       Inventories
 
Inventories are stated at the lower of cost or market.  Cost is determined by using the FIFO method for all inventories.
 
(d)      Revenue Recognition
 
Terminalling and storage – Revenue is recognized for storage contracts based on the contracted monthly tank fixed fee.  For throughput contracts, revenue is recognized based on the volume moved through the Partnership's terminals at the contracted rate.  For the Partnership's tolling agreement, revenue is recognized based on the contracted monthly reservation fee and throughput volumes moved through the facility.  When lubricants and drilling fluids are sold by truck, revenue is recognized upon delivering product to the customers as title to the product transfers when the customer physically receives the product.
 
Natural gas services – Natural gas gathering and processing revenues are recognized when title passes or service is performed.  NGL distribution revenue is recognized when product is delivered by truck to our NGL customers, which occurs when the customer physically receives the product. When product is sold in storage, or by pipeline, the Partnership recognizes NGL distribution revenue when the customer receives the product from either the storage facility or pipeline.

Sulfur services – Revenue from sulfur product sales is recognized when the customer takes title to the product.  Revenue from sulfur services is recognized as deliveries are made during each monthly period.
 
Marine transportation – Revenue is recognized for contracted trips upon completion of the particular trip.  For time charters, revenue is recognized based on a per day rate.
 
(e)       Equity Method Investments
 
The Partnership uses the equity method of accounting for investments in unconsolidated entities where the ability to exercise significant influence over such entities exists.  Investments in unconsolidated entities consist of capital contributions and advances plus the Partnership's share of accumulated earnings as of the entities' latest fiscal year-ends, less capital withdrawals and distributions.  Investments in excess of the underlying net assets of equity method investees, specifically identifiable to property, plant and equipment, are amortized over the useful life of the related assets.  Excess investment representing equity method goodwill is not amortized but is evaluated for impairment, annually.  Under certain provisions of ASC 350-20, related to goodwill, this goodwill is not subject to amortization and is accounted for as a component of the investment.  Equity method investments are subject to impairment under the provisions of ASC 323-10, which relates to the equity method of accounting for investments in common stock.  No portion of the net income from these entities is included in the Partnership's operating income.

The Partnership's Prism Gas subsidiary owns an unconsolidated 50% interest in Waskom, Matagorda, and PIPE. The Partnership owns 2.07%  of the Class A equity interests in Redbird and 100% of the Class B equity interests in Redbird.  Redbird, as of December 31, 2011, owns a 40.08% interest in Cardinal Gas Storage Partners, LLC.  Each of these interests is accounted for under the equity method of accounting.

(f)      Property, Plant, and Equipment

Owned property, plant, and equipment is stated at cost, less accumulated depreciation.  Owned buildings and equipment are depreciated using straight-line method over the estimated lives of the respective assets.

Equipment under capital leases is stated at the present value of minimum lease payments less accumulated amortization. Equipment under capital leases is amortized straight line over the estimated useful life of the asset.
 
Routine maintenance and repairs are charged to operating expense while costs of betterments and renewals are capitalized.  When an asset is retired or sold, its cost and related accumulated depreciation are removed from the accounts, and the difference between net book value of the asset and proceeds from disposition is recognized as gain or loss.
 
(g)      Goodwill and Other Intangible Assets

Goodwill represents the excess of costs over fair value of assets of businesses acquired.  Goodwill and intangible assets acquired in a purchase business combination and determined to have an indefinite useful life are not amortized, but instead, tested for impairment at least annually in accordance with certain provisions of ASC 350-20.  Intangible assets with estimated useful lives are amortized over their respective estimated useful lives to their estimated residual values and reviewed for impairment under certain provisions of ASC 360-10 related to accounting for impairment or disposal of long-lived assets.  Other intangible assets primarily consist of covenants not-to-compete and contracts obtained through business combinations and are being amortized over the life of the respective agreements.

Goodwill is subject to a fair-value based impairment test on an annual basis, or more often if events or circumstances indicate there may be impairment. The Partnership is required to identify its reporting units and determine the carrying value of each reporting unit by assigning the assets and liabilities, including the existing goodwill and intangible assets.  Goodwill is assigned to reporting units at the date the goodwill is initially recorded.  Once goodwill has been assigned to reporting units, it no longer retains its association with a particular acquisition, and all of the activities within a reporting unit, whether acquired or organically grown, are available to support value of the goodwill.

The Partnership has historically performed its annual impairment testing of goodwill and indefinite-lived intangible assets as of September 30 of each year.  During the third quarter of fiscal 2011, the Partnership changed the annual impairment testing date from September 30 to August 31.  The Partnership believes this change, which represents a change in the method of applying an accounting principle, is preferable in the circumstances as the earlier date provides additional time prior to the Partnership's quarter-end to complete the goodwill impairment testing and report the results in its quarterly report on Form 10-Q.  A preferability letter from the Partnership's independent registered public accounting firm regarding this change in the method of applying an accounting principle has been filed as an exhibit to the quarterly report on Form 10-Q for the quarter ended September 30, 2011.

The Partnership performed the annual impairment tests as of August 31, 2011, September 30, 2010, and September 30, 2009, respectively.  In performing such tests, it was determined that there were four “reporting units” which contained goodwill. These reporting units were in each of the four reporting segments: terminalling and storage, natural gas services, marine transportation, and sulfur services.  The estimated fair value of the reporting units with goodwill were developed using the guideline public company method, the guideline transaction method, and the discounted cash flow (“DCF”) method using observable market data where available.  To the extent the carrying amount of a reporting unit exceeds the fair value of the reporting unit, the Partnership would be required to perform the second step of the impairment test, as this is an indication that the reporting unit goodwill may be impaired.  At August 31, 2011, September 30, 2010 and September 30, 2009, the estimated fair value of each of the four reporting units was in excess of its carrying value, which indicates no impairment existed.
 
(h)      Debt Issuance Costs

Debt issuance costs relating to the Partnership's revolving credit facility and senior notes are deferred and amortized over the terms of the debt arrangements.

In connection with the issuance, amendment, expansion and restatement of debt arrangements, the Partnership incurred debt issuance costs of $3,589, $7,468 and $10,446 in the years ended December 31, 2011, 2010 and 2009, respectively.

Due to a reduction in the number of lenders under the Partnership's multi-bank credit agreement, $494, $634 and $495 of the existing debt issuance costs were determined not to have continuing benefit and were expensed during 2011, 2010 and 2009, respectively.  Remaining unamortized deferred issuance costs are amortized over the term of the revised debt arrangement.
 
Amortization of debt issuance costs, which is included in interest expense, totaled $3,755, $4,814 and $1,689 for the years ended December 31, 2011, 2010 and 2009, respectively.  Accumulated amortization amounted to $2,723 and $4,920 at December 31, 2011 and 2010, respectively.
 
(i)      Impairment of Long-Lived Assets
 
In accordance with ASC 360-10, long-lived assets, such as property, plant and equipment, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable.  Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows expected to be generated by the asset.  If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized by the amount by which the carrying amount of the asset exceeds the fair value of the asset.  Assets to be disposed of would be separately presented in the balance sheet and reported at the lower of the carrying amount or fair value less costs to sell and are no longer depreciated.  The assets and liabilities of a disposed group classified as held for sale would be presented separately in the appropriate asset and liability sections of the balance sheet.  The Partnership has not identified any triggering events in 2011, 2010 or 2009 that would require an assessment for impairment of long-lived assets.
 
(j)      Asset Retirement Obligation

Under ASC 410-20, which relates to accounting requirements for costs associated with legal obligations to retire tangible, long-lived assets, the Partnership records an Asset Retirement Obligation (“ARO”) at fair value in the period in which it is incurred by increasing the carrying amount of the related long-lived asset. In each subsequent period, the liability is accreted over time towards the ultimate obligation amount and the capitalized costs are depreciated over the useful life of the related asset.  The Partnership's fixed assets include land, buildings, transportation equipment, storage equipment, marine vessels and operating equipment.
 
The transportation equipment includes pipeline systems.  The Partnership transports NGLs through the pipeline system and gathering system.  The Partnership also gathers natural gas from wells owned by producers and delivers natural gas and NGLs on the Partnership's pipeline systems, primarily in Texas and Louisiana to the fractionation facility of the Partnership's 50% owned joint venture.  The Partnership is obligated by contractual or regulatory requirements to remove certain facilities or perform other remediation upon retirement of the Partnership's assets.  However, the Partnership is not able to reasonably determine the fair value of the asset retirement obligations for the Partnership's trunk and gathering pipelines and the Partnership's surface facilities since future dismantlement and removal dates are indeterminate.  In order to determine a removal date of the Partnership's gathering lines and related surface assets, reserve information regarding the production life of the specific field is required.  As a transporter and gatherer of natural gas, the Partnership is not a producer of the field reserves, and the Partnership therefore does not have access to adequate forecasts that predict the timing of expected production for existing reserves on those fields in which the Partnership gathers natural gas.  In the absence of such information, the Partnership is not able to make a reasonable estimate of when future dismantlement and removal dates of the Partnership's gathering assets will occur.  With regard to the Partnership's trunk pipelines and their related surface assets, it is impossible to predict when demand for transportation of the related products will cease.  The Partnership's right-of-way agreements allow us to maintain the right-of-way rather than remove the pipe.  In addition, the Partnership can evaluate the Partnership's trunk pipelines for alternative uses, which can be and have been found.  The Partnership will record such asset retirement obligations in the period in which more information becomes available for us to reasonably estimate the settlement dates of the retirement obligations.
 
(k)     Derivative Instruments and Hedging Activities
 
In accordance with certain provisions of ASC 815-10 related to accounting for derivative instruments and hedging activities, all derivatives and hedging instruments are included on the balance sheet as an asset or liability measured at fair value and changes in fair value are recognized currently in earnings unless specific hedge accounting criteria are met. If a derivative qualifies for hedge accounting, changes in the fair value can be offset against the change in the fair value of the hedged item through earnings or recognized in other comprehensive income until such time as the hedged item is recognized in earnings.
 
Derivative instruments not designated as hedges are being marked to market with all market value adjustments being recorded in the consolidated statements of operations.  As of December 31, 2011, the Partnership has designated a portion of its derivative instruments as qualifying cash flow hedges.  Fair value changes for these hedges have been recorded in accumulated other comprehensive income as a component of equity.
 
(l)      Comprehensive Income
 
Comprehensive income includes net income and other comprehensive income.  Other comprehensive income for the Partnership includes unrealized gains and losses on derivative financial instruments.  In accordance with ASC 815-10, the Partnership records deferred hedge gains and losses on its derivative financial instruments that qualify as cash flow hedges as other comprehensive income.
 
(m)    Unit Grants
 
In May 2011, the Partnership issued 6,250 restricted common units to non-employee directors under its long-term incentive plan from 5,750 treasury units purchased by the Partnership in the open market for $235 and 500 treasury units from forfeitures.  These units vest in 25% increments beginning in January 2012 and will be fully vested in January 2015.

In February 2011, the Partnership issued 9,100 restricted common units to certain Martin Resource Management employees under its long-term incentive plan from 9,100 treasury units purchased by the Partnership in the open market for $347.  These units vest in 25% increments beginning in February 2012 and will be fully vested in February 2015.
 
In August 2010, the Partnership issued 1,500 restricted common units to each of two new non -employee directors under its long-term incentive plan from 500 treasury units purchased by the Partnership in the open market for $16 and 2,500 common units from forfeited unit grants. These units vest in 25% increments beginning in January 2011 and will be fully vested in January 2014.
 
In May 2010, the Partnership issued 1,000 restricted common units to each of its non-employee directors under its long-term incentive plan from treasury units purchased by the Partnership in the open market for $92. These units vest in 25% increments beginning in January 2011 and will be fully vested in January 2014.
 
In August 2009, the Partnership issued 1,000 restricted common units to each of its non-employee directors under its long-term incentive plan from treasury units purchased by the Partnership in the open market for $77. These units vest in 25% increments beginning in January 2010 and will be fully vested in January 2013.

In May 2008, the Partnership issued 1,000 restricted common units to each of its non-employee directors under its long-term incentive plan from treasury units purchased by the Partnership in the open market for $93.  These units vest in 25% increments beginning in January 2009 and will be fully vested in January 2012.

The Partnership accounts for the transaction under certain provisions of FASB ASC 505-50-55 related to equity-based payments to non-employees.  The cost resulting from the unit-based payment transactions was $190, $113, and $98 for the years ended December 31, 2011, 2010 and 2009, respectively.

(n)      Incentive Distribution Rights
 
The Partnership's general partner, Martin Midstream GP LLC, holds a 2% general partner interest and certain incentive distribution rights in the Partnership.  Incentive distribution rights represent the right to receive an increasing percentage of cash distributions after the minimum quarterly distribution, any cumulative arrearages on common units, and certain target distribution levels have been achieved.  The Partnership is required to distribute all of its available cash from operating surplus, as defined in the partnership agreement.  The target distribution levels entitle the general partner to receive 15% of quarterly cash distributions in excess of $0.55 per unit until all unit holders have received $0.625 per unit, 25% of quarterly cash distributions in excess of $0.625 per unit until all unit holders have received $0.75 per unit, and 50% of quarterly cash distributions in excess of $0.75 per unit.  For the years ended December 31, 2011, 2010 and 2009, the general partner received $4,901, $3,623, and $2,896 in incentive distributions.
 
(o)      Net Income per Unit
 
ASC 260-10 relates to earnings per share, and addresses the application of the two-class method in determining income per unit for master limited partnerships having multiple classes of securities that may participate in partnership distributions accounted for as equity distributions. To the extent the partnership agreement does not explicitly limit distributions to the general partner, any earnings in excess of distributions are to be allocated to the general partner and limited partners utilizing the distribution formula for available cash specified in the partnership agreement. When current period distributions are in excess of earnings, the excess distributions for the period are to be allocated to the general partner and limited partners based on their respective sharing of losses specified in the partnership agreement. ASC 260-10 is to be applied retrospectively for all financial statements presented and is effective for financial statements issued for fiscal years beginning after December 15, 2008, and interim periods within those fiscal years.

The Partnership adopted the amended provisions of ASC 260-10 on January 1, 2009. Adoption did not impact the Partnership's computation of earnings per limited partner unit as cash distributions exceeded earnings for the years ended December 31, 2011, 2010 and 2009, respectively, and the IDRs do not share in losses under the partnership agreement.  In the event the Partnership's earnings exceed cash distributions, ASC 260-10 will have an impact on the computation of the Partnership's earnings per limited partner unit. The Partnership agreement does not explicitly limit distributions to the general partner; therefore, any earnings in excess of distributions are to be allocated to the general partner and limited partners utilizing the distribution formula for available cash specified in the Partnership agreement. For years ended December 31, 2011, 2010  and 2009, the general partner's interest in net income, including the IDRs, represents distributions declared after period end on behalf of the general partner interest and IDRs less the allocated excess of distributions over earnings for the periods.

General and limited partner interest in net income includes only net income of the Cross assets since the date of acquisition in November 2009.   Accordingly, net income of the Partnership is adjusted to remove the net income attributable to the Cross assets prior to the date of acquisition and such income is allocated to Parent.  The recognition of the beneficial conversion feature for the period is considered a deemed distribution to the subordinated unit holders and reduces net income available to common limited partners in computing net income per unit.

For purposes of computing diluted net income per unit, the Partnership uses the more dilutive of the two-class and if-converted methods.  Under the if-converted method, the beneficial conversion feature is added back to net income available to common limited partners, the weighted-average number of subordinated units outstanding for the period is added to the weighted-average number of common units outstanding for purposes of computing basic net income per unit, and the resulting amount is compared to the diluted net income per unit computed using the two-class method.

The following table reconciles net income to limited partners' interest in net income:
 
   
Years Ended December 31,
 
   
2011
  
2010
  
2009
 
Net income attributable to Martin Midstream Partners L. P
 $24,342  $16,022  $22,203 
Less pre-acquisition income allocated to Parent
  -   -   1,664 
Less general partner's interest in net income:
            
Distributions payable on behalf of IDRs
  4,901   3,623   2,896 
Distributions payable on behalf of general partner interest
  1,344   1,187   949 
Distributions payable to the general partner interest in excess of earnings allocable to the general partner interest
  (956)  (941)  (596)
Less beneficial conversion feature
  1,108   1,108   111 
Limited partners' interest in net income
 $17,945  $11,045  $17,179 
 
The weighted average units outstanding for basic net income per unit were 19,545,427, 17,525,089, and 14,680,807 for years ended December 31, 2011, 2010 and 2009, respectively.  For diluted net income per unit, the weighted average units outstanding were increased by 1,278, 900, and 3,968 units for the years ended December 31, 2011, 2010 and 2009, respectively, due to the dilutive effect of restricted units granted under the Partnership's long-term incentive plan.
 
(p)      Indirect Selling, General and Administrative Expenses
 
Indirect selling, general and administrative expenses are incurred by Martin Resource Management and allocated to the Partnership to cover costs of centralized corporate functions such as accounting, treasury, engineering, information technology, risk management and other corporate services.  Such expenses are based on the percentage of time spent by Martin Resource Management's personnel that provide such centralized services.  Under the omnibus agreement, we are required to reimburse Martin Resource Management for indirect general and administrative and corporate overhead expenses.  For the years ended December 31, 2011, 2010 and 2009, the Conflicts Committee of our general partner approved reimbursement amounts of  $4,771, $3,791, and $3,542, respectively, reflecting our allocable share of such expenses.  The Conflicts Committee will review and approve future adjustments in the reimbursement amount for indirect expenses, if any, annually.
 
(q)      Environmental Liabilities and Litigation
 
The Partnership's policy is to accrue for losses associated with environmental remediation obligations when such losses are probable and reasonably estimable.  Accruals for estimated losses from environmental remediation obligations generally are recognized no later than completion of the remedial feasibility study.  Such accruals are adjusted as further information develops or circumstances change.  Costs of future expenditures for environmental remediation obligations are not discounted to their present value.  Recoveries of environmental remediation costs from other parties are recorded as assets when their receipt is deemed probable.
 
(r)      Accounts Receivable and Allowance for Doubtful Accounts.
 
Trade accounts receivable are recorded at the invoiced amount and do not bear interest.  The allowance for doubtful accounts is the Partnership's best estimate of the amount of probable credit losses in the Partnership's existing accounts receivable.
 
(s)      Deferred Catalyst Costs

The cost of the periodic replacement of catalysts is deferred and amortized over the catalyst's estimated useful life, which ranges from 24 to 36 months.

(t)      Deferred Turnaround Costs

The Partnership capitalizes the cost of major turnarounds and amortizes these costs over the estimated period to the next turnaround, which ranges from 24 to 36 months.

(u)      Use of Estimates

Management has made a number of estimates and assumptions relating to the reporting of assets and liabilities, and the disclosure of contingent assets and liabilities to prepare these consolidated financial statements in conformity with accounting principles generally accepted in the United States.  Actual results could differ from those estimates.
 
(v)      Income Taxes
 
With respect to the Partnership's taxable subsidiary (Woodlawn Pipeline Co., Inc.) and the Cross assets prior to the date of acquisition, income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis.  Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date.
 
(w)      Prior Period Correction of an Immaterial Error
 
The statement of cash flows for the year ended December 31, 2010 has been revised to correct an immaterial error in the classification of excess purchase price over carrying value of acquired assets of $4,590.  The reclassification of this amount decreases acquisitions, net of cash acquired and net cash used in investing activities, increases the excess purchase price over carrying value of acquired assets and decreases net cash provided by financing activities, and had no effect on the Partnership's cash and cash equivalents, property, plant and equipment, net income or partners' capital.