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, 2017
Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gross Assets Presented in the Consolidated Balance Sheet $ 42,440 $ 9,184
Gross Assets Subject to Mater Netting Agreement - assets (41,180) (9,184)
Net Amount - assets 1,260 0
Gross Liabilities Presented in the Consolidated Balance Sheet (72,438) (145,978)
Gross Amounts Subject to Master Netting Agreement - liabilities 41,180 9,184
Net Amount - liabilities $ (31,258) $ (136,794)