Fair Value Measurement (Tables)	3 Months Ended
Mar. 31, 2013
Fair Value Measurement [Abstract]
Company's fair value hierarchy for its financial assets and liabilities	Company's fair value hierarchy for its financial assets and liabilities
Reconciliation of the beginning and ending Level 3 net liabilities	Reconciliation of the beginning and ending Level 3 net liabilities

- Definition

Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.

+ References+ Details