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Derivative Financial Instruments and Hedging Activities - Schedule of Changes in the Losses on Cash Flow Hedges Included in AOCL (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Beginning balance     $ 8,413 $ 10,151 $ 10,151    
Other $ 0 $ 2 0 5 4 $ 5 $ 5
Ending balance 1,886   1,886   8,413 10,151  
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]              
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Beginning balance     8,413 10,151 10,151 6,441 7,896
Additional net losses on cash flow hedges         0 12,363 8,315
Ineffectiveness of cash flow hedges reclassified to earnings         0 (657) 41
Losses on terminated hedging relationships amortized to earnings     (6,916) (1,579) (1,982) (10,816) (10,592)
Net increase (decrease) in accumulated losses on cash flow hedges         (1,982) 890 (2,236)
Decrease in deferred taxes on accumulated losses on cash flow hedges     389 217 248 2,825 786
Increase (decrease) in accumulated losses on cash flow hedges, net of taxes     (6,527) (1,362) (1,734) 3,715 (1,450)
Other     0 (5) (4) (5) (5)
Ending balance $ 1,886 $ 8,784 $ 1,886 $ 8,784 $ 8,413 $ 10,151 $ 6,441