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Offsetting (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Offsetting Assets [Line Items]    
Gross amounts of recognized, asset $ 67,880 [1] $ 18,518 [1]
Gross amount offset in the balance sheet 0 0
Net amounts presented in the balance sheet, asset 67,880 18,518
Gross amounts not offset in the balance sheet, financial instruments, asset (3,459) (12,051)
Gross amounts not offset in the balance sheet, cash collateral pledged 0 0
Net amount, asset 64,421 6,467
Gross amounts of recognized, liability (18,882) [1] (30,502) [1]
Gross amount offset in the balance sheet 0 0
Net amounts presented in the balance sheet, liability (18,882) (30,502)
Gross amounts not offset in the balance sheet, financial instruments, liability 3,459 12,051
Gross amounts not offset in the balance sheet, cash collateral received 6,286 0
Net amount, liability $ (9,137) $ (18,451)
[1] Amounts include all derivative instruments, irrespective of whether there is a legally enforceable master netting arrangement in place.