Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments (Schedule of Offsetting) (Details)

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Derivative Instruments (Schedule of Offsetting) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gross Assets Presented in the Consolidated Balance Sheet $ 41,741 $ 9,184
Gross Assets Subject to Mater Netting Agreement - assets (36,969) (9,184)
Net Amount - assets 4,772 0
Gross Liabilities Presented in the Consolidated Balance Sheet (48,842) (145,978)
Gross Amounts Subject to Master Netting Agreement - liabilities 36,969 9,184
Net Amount - liabilities $ (11,873) $ (136,794)