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)

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Fair Value Measurements and Derivatives - Amounts recognized within assets and liabilities based on right of offset (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Fair Value Disclosures [Abstract]    
Gross Amounts, Assets $ 770 $ 12,125
Gross Amounts Offset, Assets (346) (1,527)
Total Net Amounts, Assets 424 10,598
Gross Amounts Not Offset, Assets   (6,872)
Total Net Amounts, Assets 424 3,726
Gross Amounts, Liabilities 331,803 116,352
Gross Amounts Offset, Liabilities (773) (5,092)
Total Net Amounts, Liabilities 331,030 111,260
Gross Amounts Not Offset, Liabilities (260,131) (35,718)
Total Net Amounts, Liabilities $ 70,899 $ 75,542