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Stock Dividends
9 Months Ended
Sep. 30, 2011
Stock Dividends [Abstract] 
Stock Dividends
(9)   The increase in common stock during the nine months ended September 30, 2011, was primarily due to the issuance of 1,180,276 shares of the Company's common stock under its stock-based compensation plans. The Company announced a $0.01 per share increase in its quarterly cash dividend rate during the first quarter of 2011, which resulted in a recorded cash dividend of $0.12 per share in each of the first, second and third quarters of 2011. The third quarter dividend of approximately $17,217,000, was declared on August 17, 2011 and was paid on October 21, 2011.