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Derivative Financial Instruments (Derivative Gains Included In Accumulated Other Comprehensive Loss (AOCL) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Derivative Gains Included in AOCI [Roll Forward]        
Beginning balance $ 9,988 $ 13,933 $ 13,627 $ 14,126
Net gain (loss) on cash flow hedges 0 [1] 0 [1] (3,613) [1] (4,560) [1]
Reclassification of net loss (gain) on cash flow hedges to income (153) [1] (41) [1] (179) [1] 4,326 [1]
Ending balance $ 9,835 $ 13,892 $ 9,835 $ 13,892
[1] See Note 9–Derivative Financial Instruments for details of the amount of gain/loss recognized in accumulated other comprehensive loss ("AOCL") on derivatives and the amount of gain/loss reclassified from AOCL into income.