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Derivative Financial Instruments and Hedging Activities - Schedule of Changes in AOCL (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance     $ 8,413  
Other, net of taxes $ 0 $ 1 0 $ 2
Ending balance 2,380   2,380  
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance     8,413 10,151
Losses on terminated hedging relationships amortized to earnings     (6,393) (1,171)
Decrease in deferred taxes on accumulated losses on cash flow hedges     360 193
Decrease in accumulated losses on cash flow hedges, net of taxes     (6,033) (978)
Other, net of taxes     0 (2)
Ending balance $ 2,380 $ 9,171 $ 2,380 $ 9,171