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Derivative Financial Instruments Income Statement Effect of Derivative Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative settlements, net $ (5,442) $ (6,214) $ (10,657) $ (12,443)
Other Income [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative settlements, net (5,442) (6,214) (10,657) (12,443)
Change in fair value 26,615 5,033 (19,457) 7,950
Re-measurement of Euro Notes (foreign currency transaction adjustment) - income (expense) (14,671) 2,751 33,538 1,798
Derivative market value and foreign currency adjustments and derivative settlements - income (expense) 6,502 1,570 3,424 (2,695)
1:3 basis swaps [Member] | Other Income [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative settlements, net 123 858 389 1,739
Change in fair value 1,428 11,910 12,398 13,020
Interest rate swaps - floor income hedges [Member] | Other Income [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative settlements, net (5,019) (6,974) (10,034) (13,924)
Change in fair value 7,534 (2,813) 2,662 545
Interest rate swap option - floor income hedges [Member] | Other Income [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in fair value 1,381 0 470 0
Interest rate swaps - hybrid debt hedges [Member] | Other Income [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative settlements, net (253) (256) (505) (508)
Change in fair value 2,540 (1,065) 1,087 (2,578)
Interest Rate Cap [Member] | Other Income [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in fair value (201) 0 (201) 0
Cross-currency interest rate swaps [Member] | Other Income [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative settlements, net (293) 158 (507) 250
Change in fair value $ 13,933 $ (2,999) $ (35,873) $ (3,037)