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Derivative Instruments (Details 3) (Interest Rate Swap Member, USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Derivatives In Cash Flow Hedging Relationships [Line Items]    
Gains Losses Deferred In Accumulated Other Comprehensive Income Loss On Derivatives Effective Portion $ 464 $ 787
Investment Related Gains Losses [Member]
   
Derivatives In Cash Flow Hedging Relationships [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0 0
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net 27 3
Investment Income [Member]
   
Derivatives In Cash Flow Hedging Relationships [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 321 678
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net $ 0 $ 0