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Earnings Per Share - Narrative (Details) (USD $)
3 Months Ended
Mar. 31, 2014
Common Stock  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Number of shares converted into 39,997,114us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Conversion of outstanding Series A convertible preferred stock  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Noncumulative dividend rate per annum (in US$ per share) $ 0.045us-gaap_PreferredStockDividendRatePerDollarAmount
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Conversion of outstanding Series B convertible preferred stock  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Noncumulative dividend rate per annum (in US$ per share) $ 0.0765us-gaap_PreferredStockDividendRatePerDollarAmount
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Conversion of outstanding Series C convertible preferred stock  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Noncumulative dividend rate per annum (in US$ per share) $ 0.11169us-gaap_PreferredStockDividendRatePerDollarAmount
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
Conversion of outstanding Series D redeemable convertible preferred stock  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Noncumulative dividend rate per annum (in US$ per share) $ 60us-gaap_PreferredStockDividendRatePerDollarAmount
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember