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Common Stock (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
1 Months Ended 3 Months Ended 43 Months Ended
Apr. 30, 2014
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2014
Dec. 31, 2014
Class of Stock [Line Items]          
Common stock, shares outstanding (in shares)   162,463,456us-gaap_CommonStockSharesOutstanding     162,181,939us-gaap_CommonStockSharesOutstanding
Payments for Repurchase of Common Stock   $ 0us-gaap_PaymentsForRepurchaseOfCommonStock $ 506us-gaap_PaymentsForRepurchaseOfCommonStock    
Dividends declared (in dollars per share) $ 0.46us-gaap_CommonStockDividendsPerShareDeclared     $ 0.605us-gaap_CommonStockDividendsPerShareDeclared  
Dividends declared per day (in dollars per share)       $ 0.0016575342arct_CommonStockDividendsPerSharePerDayDeclared  
Common stock          
Class of Stock [Line Items]          
Common stock, shares outstanding (in shares)   162,463,456us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
    162,181,939us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember