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
Sep. 30, 2017
Dec. 31, 2016
Fair Value Disclosures [Abstract]    
Gross Amounts, Assets $ 118,195 $ 20,302
Gross Amounts Offset, Assets (3,257) 0
Total Net Amounts, Assets 114,938 20,302
Gross Amounts Not Offset, Assets (100,582) (14)
Net Amounts, Assets 14,356 20,288
Gross Amounts, Liabilities 45,523 238,069
Gross Amounts Offset, Liabilities (11,961) (13,237)
Total Net Amounts, Liabilities 33,562 224,832
Gross Amounts Not Offset, Liabilities (1,876) (155,190)
Net Amounts, Liabilities $ 31,686 $ 69,642