Significant Accounting Policies (Policies)	6 Months Ended
Significant Accounting Policies (Policies)	Jun. 30, 2013
Accounting Changes And Error Corrections [Abstract]
Revision of Prior Period Financial Statements	Revision of Prior Period Financial Statements In connection with the preparation of the consolidated financial statements for the fourth quarter of 2012, the Company identified an error in the treatment of a certain prior year deferred tax asset in the Consolidated Balance Sheets. This resulted in an understatement of net noncurrent deferred income tax liability and an overstatement of retained earnings, and therefore equity, for each of the impacted periods. This error affected the Consolidated Balance Sheets and Consolidated Statements of Changes in Stockholders’ Equity as presented in each of the quarters of 2012, 2011 and 2010, including the year-end consolidated financial statements for 2011 and 2010. This resulted in an understatement of deferred income taxes and an overstatement of retained earnings for each of the impacted periods. In accordance with accounting guidance presented in ASC 250-10 (SEC Staff Accounting Bulletin No. 99, Materiality), the Company assessed the materiality of the error and concluded that it was not material to any of the Company’s previously issued financial statements taken as a whole. The Company has revised previously issued financial statements to correct the effect of this error. This revision did not affect the Company’s Consolidated Statements of Operations or Consolidated Statements of Cash Flows for any of these periods.
Offsetting of Financial Assets and Liabilities	Recently Adopted Pronouncements In December 2011, the Financial Accounting Standards Board (“FASB”) issued new guidance that is intended to enhance current disclosures on offsetting financial assets and liabilities. The new guidance requires an entity to disclose both gross and net information about financial instruments eligible for offset on the balance sheet and instruments and transactions subject to an agreement similar to a master netting arrangement. The provisions of the new guidance are effective for fiscal years, and interim periods within those years, beginning on or after January 1, 2013. The new guidance did not have a material impact on the Company’s consolidated financial statements.
Reclassifications Out of Accumulated Other Comprehensive Income	In February 2013, the FASB issued new guidance which establishes new requirements for disclosing reclassifications of items out of accumulated other comprehensive income. The new guidance requires a company to report the effect of significant reclassifications from accumulated other comprehensive income to the respective line items in net income or cross-reference to other disclosures for items not reclassified entirely to net income. The new guidance was effective for annual and interim periods beginning after December 15, 2012. The new guidance expands disclosure of other comprehensive income but does not change the manner in which items of other comprehensive income are accounted or the way in which net income or other comprehensive income is reported in the financial statements. The Company elected to report this information within the notes to the consolidated financial statements.
Recently Issued Pronouncements Income Tax	Recently Issued Pronouncements In July 2013, the FASB issued new guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The provisions of the new guidance are effective for fiscal years beginning after December 15, 2013 with early adoption permitted. The Company does not expect the requirements of this new guidance to have a material impact on the Company’s consolidated financial statements.

Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.

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