(1)
| The three and twelve months ended December 31, 2011 and December 31, 2010 include 10,017,858 and 9,914,076 shares of common stock, respectively, potentially issuable pursuant to the exchange feature of the exchangeable senior notes due 2030 based on the "if converted" method. The three months ended December 31, 2011 and December 31, 2010 include 1,460,972 and 1,304,587 shares of unvested restricted stock, respectively, which are considered anti-dilutive for purposes of calculating diluted earnings per share. The twelve months ended December 31, 2011 and December 31, 2010 include 1,433,465 and 1,263,034 shares of unvested restricted stock, respectively, which are considered anti-dilutive for purposes of calculating diluted earnings per share.
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