New Accounting Standards	3 Months Ended
Mar. 31, 2012
New Accounting Standards [Abstract]
NEW ACCOUNTING STANDARDS	2. NEW ACCOUNTING STANDARDS Fair Value Measurement. In May 2011, the FASB issued additional guidance on fair value disclosures. This guidance contains certain updates to the measurement guidance as well as enhanced disclosure requirements. The most significant change in disclosures is an expansion of the information required for “Level 3” measurements including enhanced disclosure for: (1) the valuation processes used by the reporting entity; and (2) the sensitivity of the fair value measurement to changes in unobservable inputs and the interrelationships between those unobservable inputs, if any. This guidance is effective for interim and annual periods beginning on or after December 15, 2011. As of March 31, 2012, the only asset or liability which requires Level 3 measurements is the Company’s diesel fuel hedge. The Company adopted this guidance as of January 1, 2012. See Note 11 for further information. Presentation of Comprehensive Income. In September 2011, the FASB issued guidance on the presentation of comprehensive income. This guidance eliminates the option to report other comprehensive income and its components in the statement of changes in equity. The guidance allows two presentation alternatives: (1) present items of net income and other comprehensive income in one continuous statement, referred to as the statement of comprehensive income; or (2) in two separate, but consecutive, statements of net income and other comprehensive income. This guidance is effective as of the beginning of a fiscal year that begins after December 15, 2011. Full retrospective application is required. The guidance also previously required the presentation of adjustments for items that are reclassified from other comprehensive income to net income in the statement where the components of net income and the components of other comprehensive income are presented; however, this portion of the guidance has been deferred. The Company adopted this guidance as of January 1, 2012 and elected to present items of net income and other comprehensive income in two separate, but consecutive, statements of net income and comprehensive income.

New Accounting Standards

3 Months Ended

Mar. 31, 2012

2. NEW ACCOUNTING STANDARDS

Fair Value Measurement. In May 2011, the FASB issued additional guidance on fair value disclosures. This guidance contains certain updates to the measurement guidance as well as enhanced disclosure requirements. The most significant change in disclosures is an expansion of the information required for “Level 3” measurements including enhanced disclosure for: (1) the valuation processes used by the reporting entity; and (2) the sensitivity of the fair value measurement to changes in unobservable inputs and the interrelationships between those unobservable inputs, if any. This guidance is effective for interim and annual periods beginning on or after December 15, 2011. As of March 31, 2012, the only asset or liability which requires Level 3 measurements is the Company’s diesel fuel hedge. The Company adopted this guidance as of January 1, 2012. See Note 11 for further information.

Presentation of Comprehensive Income. In September 2011, the FASB issued guidance on the presentation of comprehensive income. This guidance eliminates the option to report other comprehensive income and its components in the statement of changes in equity. The guidance allows two presentation alternatives: (1) present items of net income and other comprehensive income in one continuous statement, referred to as the statement of comprehensive income; or (2) in two separate, but consecutive, statements of net income and other comprehensive income. This guidance is effective as of the beginning of a fiscal year that begins after December 15, 2011. Full retrospective application is required. The guidance also previously required the presentation of adjustments for items that are reclassified from other comprehensive income to net income in the statement where the components of net income and the components of other comprehensive income are presented; however, this portion of the guidance has been deferred. The Company adopted this guidance as of January 1, 2012 and elected to present items of net income and other comprehensive income in two separate, but consecutive, statements of net income and comprehensive income.