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Derivative instruments - Summarizes Gross Asset and Liability Amounts Related to Derivatives (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Derivatives, Fair Value [Line Items]  
Gross Amount of Assets Recognized as Liabilities $ 1
Gross Amounts Offset in the Statement of Financial Position (156)
Net Amounts of Liabilities Presented in the Statement of Financial Position (155)
Interest rate swaps [Member]
 
Derivatives, Fair Value [Line Items]  
Gross Amount of Assets Recognized as Liabilities   
Gross Amounts Offset in the Statement of Financial Position (156)
Net Amounts of Liabilities Presented in the Statement of Financial Position (156)
Interest rate caps [Member]
 
Derivatives, Fair Value [Line Items]  
Gross Amount of Assets Recognized as Liabilities 1
Gross Amounts Offset in the Statement of Financial Position   
Net Amounts of Liabilities Presented in the Statement of Financial Position $ 1