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Derivative instruments (Tables)
 6 Months Ended
Jun. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Company's Derivative Instruments, Weighted Average Maturities and Interest Rates
The Company’s derivative instruments consist of the following at June 30, 2013 and December 31, 2012:
 
 
 
 
June 30, 2013
 
December 31, 2012
 
Balance Sheet Location
 
Notional
Value
 
Estimated
Fair Value
 
Notional
Value
 
Estimated
Fair Value
Interest rate swaps
Derivative instruments
 
$
63,365

  
$
(25
)
 
$
80,881

  
$
(156
)
Interest rate caps
Derivative instruments
 
105,635

* 
—

 
203,248

* 
1

Total derivative instruments
 
 
 
 
$
(25
)
 
 
 
$
(155
)
 
*
Represents the notional values at June 30, 2013 and December 31, 2012, but does not include forward-starting notionals.
Summary of Amounts Recognized on Consolidated Statements of Operations Related to Company's Derivatives
The following table summarizes the amounts recognized on the consolidated statements of operations related to the Company’s derivatives for the three and six months ended June 30, 2013 and 2012.
 
 
 
 
Three months ended June 30,
 
Six months ended June 30,
 
Location of Loss Recognized in Income
 
2013
 
2012
 
2013
 
2012
Interest rate swaps
Loss on derivative instruments – realized *
 
$
(59
)
 
$
(257
)
 
$
(133
)
 
$
(669
)
Interest rate swaps
Gain on derivative instruments – unrealized
 
58

 
217

 
131

 
364

Interest rate caps
Loss on derivative instruments - unrealized
 
(1
)
 
(25
)
 
(1
)
 
(177
)
Total
 
 
$
(2
)
 
$
(65
)
 
$
(3
)
 
$
(482
)
 
*
Realized losses represent net amounts accrued for the Company’s derivative instruments during the period.
Summarizes Gross Asset and Liability Amounts Related to Derivatives
The following table summarizes the gross asset and liability amounts related to the Company’s derivatives at June 30, 2013 and December 31, 2012.
 
 
June 30, 2013
 
December 31, 2012
 
Gross
Amount of
Assets
Recognized
as
Liabilities
 
Gross
Amounts
Offset in the
Statement
of Financial
Position
 
Net Amounts
of Liabilities
Presented in
the Statement
of Financial
Position
 
Gross
Amount of
Assets
Recognized
as
Liabilities
 
Gross
Amounts
Offset in the
Statement
of Financial
Position
 
Net Amounts
of Liabilities
Presented in
the Statement
of Financial
Position
Interest rate swaps
$
—

 
$
(25
)
 
$
(25
)
 
$
—

 
$
(156
)
 
$
(156
)
Interest rate caps
—

 
—

 
—

 
1

 
—

 
1

Total derivative instruments
$
—

 
$
(25
)
 
$
(25
)
 
$
1

 
$
(156
)
 
$
(155
)