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Condensed Consolidated Balance Sheets [Parenthetical] (USD $)
Mar. 31, 2015
Dec. 31, 2014
Preferred stock, shares authorized 7,000,000us-gaap_PreferredStockSharesAuthorized 7,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value (in dollars per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 300,000,000us-gaap_CommonStockSharesAuthorized 300,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares outstanding 90,336,643us-gaap_CommonStockSharesOutstanding 87,789,679us-gaap_CommonStockSharesOutstanding