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Description of Business and Basis of Presentation (Policies)
 3 Months Ended
Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Misclassification Correction
We have revised the previously reported Condensed Consolidated Statement of Cash Flows for three months ended March 31, 2014. Historically, non-cash purchases of property and equipment were previously included within capital expenditures. The revision increased Net cash used in investing activities and increased Net cash provided by operating activities by $7.5 million for the three months ended March 31, 2014. We do not believe that these misclassifications were material to the previously reported interim financial statements. The above adjustments had no effect on previously reported Statements of Operations, Statements of Financial Position or Statements of Invested Equity/Stockholders' Equity.
Use of Estimates
The preparation of our financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates, judgments and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities as of the date of the financial statements, and the reported amount of revenues and expenses during the reporting period. We base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.
New Accounting Pronouncements
Adoption of New Accounting Standards

Service Concession Arrangements

During the first quarter of 2015, we adopted the Financial Accounting Standards Board’s (the “FASB’s”) guidance on the accounting for service concession arrangements with public sector entities. This guidance specifies that an operating entity should not account for a service concession arrangement as a lease and the infrastructure used in a service concession arrangement should not be recognized as property, plant and equipment. This guidance applies when the public sector entity controls the services that the operating entity must provide within the infrastructure and also controls any residual interest in the infrastructure at the end of the term of the arrangement. This guidance did not have a material effect on our financial statements.

Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity

During the first quarter of 2015, we adopted the FASB guidance on reporting discontinued operations and disclosures of disposals of components of an entity. The new guidance changes the requirements, including additional disclosures, for reporting discontinued operations which may include a component of an entity or a group of components of an entity, or a business or nonprofit activity. Under the new guidance, a discontinued operation is defined as a disposal of a component or group of components that is disposed of or is classified as held for sale and represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results. This guidance did not have a material effect on our consolidated financial statements.

Recent Pronouncements

Simplifying the Presentation of Debt Issuance Costs

In April 2015, the FASB issued principles-based guidance addressing the recognition of debt issuance costs related to a recognized debt liability. The guidance requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. This guidance is to be applied retrospectively and is effective for interim and annual periods beginning after December 15, 2015. Early adoption is permitted for financial statements that have not been previously issued. We do not expect this guidance to have a material effect on our financial statements.

Revenue from Contracts with Customers

In May 2014, the FASB issued principles-based guidance addressing revenue recognition issues. The guidance may be applied to all contracts with customers regardless of industry-specific or transaction specific fact patterns. This guidance is to be applied retrospectively and is effective for interim and annual periods beginning after December 15, 2016. Early adoption is not permitted. We are currently evaluating the impact of this guidance on our consolidated financial statements.