Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives - Amounts Recognized Within Assets and Liabilities Based on Right of Offset (Details 1)

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Fair Value Measurements and Derivatives - Amounts Recognized Within Assets and Liabilities Based on Right of Offset (Details 1) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Fair Value Disclosures [Abstract]    
Gross Amounts, Assets $ 128,211 $ 176,455
Gross Amounts Offset, Assets (3,618) (6,605)
Total Net Amounts, Assets 124,593 169,850
Gross Amounts Not Offset, Assets (42,913) (127,924)
Net Amounts, Assets 81,680 41,926
Gross Amounts, Liabilities 4,760 6,516
Gross Amounts Offset, Liabilities 0 (576)
Total Net Amounts, Liabilities 4,760 5,940
Gross Amounts Not Offset, Liabilities (4,760) (1,020)
Net Amounts, Liabilities $ 0 $ 4,920