Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity Dividend Reinvestment and Direct Stock Purchase Plan (Details)

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Stockholders' Equity Dividend Reinvestment and Direct Stock Purchase Plan (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Class of Stock [Line Items]    
Common Stock, Capital Shares Reserved for Future Issuance 7,500,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance  
Stock Issued During Period, Shares, Dividend Reinvestment Plan 232,878two_StockIssuedAndOutstandingSharesDividendReinvestmentPlan  
Stock Issued and Outstanding, Value, Dividend Reinvestment Plan $ 2,468two_StockIssuedAndOutstandingValueDividendReinvestmentPlan  
Stock Issued During Period, Shares, Dividend Reinvestment Plan 19,412us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan 10,780us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan
Stock Issued During Period, Value, Dividend Reinvestment Plan $ 200us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan $ 110us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan