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Derivative Instruments (Tables)
9 Months Ended
Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Gain Loss on Derivative Instruments
(in thousands)  Three months ended
September 30,
  Nine months ended
September 30,
   2015  2014  2015  2014
  Gain on derivative instrument  $1   $—     $84   $39