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Common Stock (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended
Mar. 09, 2015
Mar. 31, 2015
Mar. 31, 2014
Mar. 09, 2015
Dec. 31, 2014
Class of Stock [Line Items]          
Common stock, par value (in dollars per share)   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare     $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Shares issued, price per share $ 12.80us-gaap_SharesIssuedPricePerShare     $ 12.80us-gaap_SharesIssuedPricePerShare  
Proceeds from sale of common stock $ 463,100us-gaap_ProceedsFromIssuanceOfCommonStock $ 463,218us-gaap_ProceedsFromIssuanceOfCommonStock $ 0us-gaap_ProceedsFromIssuanceOfCommonStock    
Common Stock [Member]          
Class of Stock [Line Items]          
Issuance of common stock, shares 36,800,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		        
Additional Paid-in-Capital [Member]          
Class of Stock [Line Items]          
Proceeds from sale of common stock 462,700us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		        
Common Stock [Member]          
Class of Stock [Line Items]          
Issuance of common stock, shares   36,800,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Proceeds from sale of common stock $ 368us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Over-Allotment Option [Member] | Common Stock [Member]          
Class of Stock [Line Items]          
Issuance of common stock, shares 4,800,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_OverAllotmentOptionMember