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Series A Preferred Stock (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 0 Months Ended
Mar. 31, 2015
item
Dec. 30, 2005
Feb. 29, 2012
Class of Stock [Line Items]      
Preferred stock, shares sold     3,000,000us-gaap_PreferredStockSharesIssued
Annual dividend rate 6.25%us-gaap_PreferredStockDividendRatePercentage    
Preferred stock, liquidation preference per share $ 10.00us-gaap_PreferredStockLiquidationPreference    
Number of directors entitled to shareholders 2sppr_NumberOfDirectorsEntitledToShareholders    
Preferred Stock Series A [Member]      
Class of Stock [Line Items]      
Preferred stock, shares sold   1,521,258us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
 
Annual dividend rate 8.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
8.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
 
Preferred stock, shares outstanding 803,270us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
   
Preferred stock, liquidation preference per share   $ 10.00us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
 
Preferred stock, fixed annual amount of dividend per share   $ 0.80us-gaap_PreferredStockDividendRatePerDollarAmount
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
 
Preferred stock, redemption price $ 10.00us-gaap_PreferredStockRedemptionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
   
Accumulated but unpaid dividends $ 0.9us-gaap_PreferredStockAmountOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
   
Accumulated but unpaid dividends per share $ 1.12us-gaap_PreferredStockPerShareAmountsOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember