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Derivative Instruments (Tables)
 3 Months Ended
Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Interest Rate Derivatives
 
 
 
March 31, 2015
 
December 31, 2014
Expiration Date
Stated
Interest
Rate
 
Notional
Amount
 
Market
Value
(Liability)
 
Notional
Amount
 
Market
Value
(Liability)
May 9, 2016
2.020
%
 
56,250

 
(913
)
 
58,125

 
(1,071
)
June 30, 2017
1.183
%
 
56,250

 
(519
)
 
58,125

 
(348
)