Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Class of Stock [Line Items]      
Common Stock, Capital Shares Reserved for Future Issuance 7,500,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance    
Stock Issued and Outstanding, Shares, Dividend Reinvestment Plan 213,466two_StockIssuedAndOutstandingSharesDividendReinvestmentPlan    
Stock Issued and Outstanding, Value, Dividend Reinvestment Plan $ 2,268two_StockIssuedAndOutstandingValueDividendReinvestmentPlan    
Stock Issued During Period, Shares, Dividend Reinvestment Plan 57,218us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan 71,961us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan 84,287us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan
Stock Issued During Period, Value, Dividend Reinvestment Plan $ 587us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan $ 801us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan $ 880us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan