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
Mar. 31, 2018
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gross Assets Presented in the Consolidated Balance Sheet $ 66,675 $ 87,532
Gross Assets Subject to Mater Netting Agreement - assets (27,431) (22,199)
Net Amount - assets 39,244 65,333
Gross Liabilities Presented in the Consolidated Balance Sheet (40,069) (35,523)
Gross Amounts Subject to Master Netting Agreement - liabilities 27,431 22,199
Net Amount - liabilities $ (12,638) $ (13,324)