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
Mar. 31, 2018
Dec. 31, 2017
Fair Value Disclosures [Abstract]    
Gross Amounts, Assets $ 223,392 $ 6,352
Gross Amounts Offset, Assets (7,312) (190)
Total Net Amounts, Assets 216,080 6,162
Gross Amounts Not Offset, Assets (117,233) (332)
Net Amounts, Assets 98,847 5,830
Gross Amounts, Liabilities 176,455 6,516
Gross Amounts Offset, Liabilities (6,605) (576)
Total Net Amounts, Liabilities 169,850 5,940
Gross Amounts Not Offset, Liabilities (127,924) (1,020)
Net Amounts, Liabilities $ 41,926 $ 4,920