Annual report pursuant to Section 13 and 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
Dec. 31, 2018
Dec. 31, 2017
Fair Value Disclosures [Abstract]    
Gross Amounts, Assets $ 12,125 $ 176,455
Gross Amounts Offset, Assets (1,527) (6,605)
Total Net Amounts, Assets 10,598 169,850
Gross Amounts Not Offset, Assets (6,872) (127,924)
Total Net Amounts, Assets 3,726 41,926
Gross Amounts, Liabilities 116,352 6,516
Gross Amounts Offset, Liabilities (5,092) (576)
Total Net Amounts, Liabilities 111,260 5,940
Gross Amounts Not Offset, Liabilities (35,718) (1,020)
Total Net Amounts, Liabilities $ 75,542 $ 4,920