Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheets (Unaudited) (Parenthetical)

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Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Common Stock, par value (in dollars per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, shares authorized (in shares) 750,000,000us-gaap_CommonStockSharesAuthorized 750,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, shares issued (in shares) 433,421,677us-gaap_CommonStockSharesIssued 414,818,195us-gaap_CommonStockSharesIssued
Treasury stock, shares (in shares) 1,245,367us-gaap_TreasuryStockShares 2,264,063us-gaap_TreasuryStockShares