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Changes in Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Changes in accumulated other comprehensive loss by component        
Accumulated comprehensive loss at beginning of the year     $ (134,516)  
Other comprehensive income before reclassifications     118,297  
Amounts reclassified from accumulated other comprehensive loss     (50,697)  
Net current-period other comprehensive income 73,160 82,653 67,600 (67,150)
Ending balance (66,916)   (66,916)  
Changes related to cash flow derivative hedges
       
Changes in accumulated other comprehensive loss by component        
Accumulated comprehensive loss at beginning of the year     (84,505)  
Other comprehensive income before reclassifications     109,154  
Amounts reclassified from accumulated other comprehensive loss     (52,639)  
Net current-period other comprehensive income     56,515  
Ending balance (27,990)   (27,990)  
Changes in defined benefit plans
       
Changes in accumulated other comprehensive loss by component        
Accumulated comprehensive loss at beginning of the year     (34,823)  
Other comprehensive income before reclassifications     8,774  
Amounts reclassified from accumulated other comprehensive loss     1,942  
Net current-period other comprehensive income     10,716  
Ending balance (24,107)   (24,107)  
Foreign currency translation adjustments
       
Changes in accumulated other comprehensive loss by component        
Accumulated comprehensive loss at beginning of the year     (15,188)  
Other comprehensive income before reclassifications     369  
Net current-period other comprehensive income     369  
Ending balance $ (14,819)   $ (14,819)