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Common Stock
 6 Months Ended
Jun. 30, 2021
Stockholders' Equity Note [Abstract]  
Common Stock Common Stock        
As of June 30, 2021 and December 31, 2020, there were 53,747,352 and 54,755,900 shares of our common stock outstanding, respectively.
During the three months ended June 30, 2021 and 2020, we issued 36,044 and 60,155 shares of common stock, respectively. During the six months ended June 30, 2021 and 2020, we issued 127,287 and 161,850 shares of common stock, respectively. These shares were issued upon either the satisfaction of required conditions under our share-based compensation plans or the purchase of common stock pursuant to our employee stock purchase plan.
We have paid quarterly dividends since October 25, 2011. We currently pay a regular quarterly dividend of $0.13 per share.
In September 2011, our Board of Directors (the “Board”) authorized a share repurchase program allowing us to begin repurchasing shares of our outstanding common stock. Subsequently, the Board has from time to time increased the amount of our common stock that we may repurchase under such program. Since the inception of the repurchase program, the Board has authorized us to repurchase up to $1.15 billion of our outstanding common stock. During the six months ended June 30, 2021, we repurchased approximately 1.1 million shares of our common stock for approximately $138.0 million. Since the inception of the repurchase program through June 30, 2021, we have repurchased approximately 18.7 million shares of our common stock for approximately $1,042.1 million. As of June 30, 2021, there remained authorization for us to repurchase approximately $107.9 million of our shares. The repurchase program has no expiration date, does not obligate the Company to acquire any particular amount of common stock, and may be suspended, recommenced, or discontinued at any time or from time to time without prior notice. We may repurchase our shares from time to time to the extent permitted by securities laws and other legal requirements, including provisions in our 2020 Credit Agreement placing limitations on such repurchases. The repurchase program has been and will be funded from our operations.