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Derivative Financial Instruments and Hedging Activities - Accumulated Other Comprehensive Loss (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance     $ 10,151  
Other 2 31 5 711
Ending balance 8,784   8,784  
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance     10,151 6,441
Additional net losses on cash flow hedges     0 12,363
Ineffectiveness of cash flow hedges reclassified to earnings     0 (657)
Losses on terminated hedging relationships amortized to earnings     (1,579) (9,434)
Net increase (decrease) in accumulated losses on cash flow hedges     (1,579) 2,272
Decrease (increase) in deferred taxes on accumulated losses on cash flow hedges     217 (933)
(Decrease) increase in accumulated losses on cash flow hedges, net of taxes     (1,362) 1,339
Other     (5) (711)
Ending balance $ 8,784 $ 7,069 $ 8,784 $ 7,069