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, 2019
Dec. 31, 2018
Fair Value Disclosures [Abstract]    
Gross Amounts, Assets $ 40,751 $ 12,125
Gross Amounts Offset, Assets (5,816) (1,527)
Total Net Amounts, Assets 34,935 10,598
Gross Amounts Not Offset, Assets (1,519) (6,872)
Net Amounts, Assets 33,416 3,726
Gross Amounts, Liabilities 132,146 116,352
Gross Amounts Offset, Liabilities (1,938) (5,092)
Total Net Amounts, Liabilities 130,208 111,260
Gross Amounts Not Offset, Liabilities (114,046) (35,718)
Net Amounts, Liabilities $ 16,162 $ 75,542