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Consolidated Statements of Stockholders' Equity (Parenthetical) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Phantom and restricted stock issuances (in shares) | 393,818 | 11,323 | 193,602
Stock options exercised (in shares) | 0 | 22,095 | 650,621
Share repurchase (in shares) |  | 13,948,687 | 8,620,689
Common stock issued upon exchange of convertible securities (in shares) | 3,664,729 | 1,323,322 | 900,290

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