Shareholders' Equity	6 Months Ended
Shareholders' Equity	Jun. 30, 2011
Shareholders' Equity [Abstract]
Shareholders' Equity	13. Shareholders’ Equity On February 21, 2011, our Board of Directors authorized an increase in the payment of quarterly dividends on our common stock from $0.29 per share to $0.32 per share, effective for the first quarter of 2011. On February 22, 2010, our Board of Directors authorized an increase in our quarterly cash dividend from $0.27 per share to $0.29 per share, effective for the first quarter of 2010. Generally, our dividend date-of-record is in the last month of the quarter, and the dividend is paid the following month. On February 26, 2008, our Board of Directors authorized a program to repurchase up to $300.0 million of our outstanding common stock over an unspecified time period, and the program commenced in the second quarter of 2008. We repurchased 100,000 shares for $12.2 million and 112,500 shares for $11.1 million during the three months ended June 30, 2011 and 2010, respectively. We repurchased 212,500 shares for $26.0 million and 225,000 shares for $23.1 million during the six months ended June 30, 2011 and 2010, respectively. To date, we have repurchased a total of 2,948,100 shares for $278.0 million under this program.

Disclosures related to accounts comprising shareholders' equity, including other comprehensive income. Includes: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables; effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

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