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, 2016
Dec. 31, 2015
Fair Value Disclosures [Abstract]    
Gross Amounts, Assets $ 42,335 $ 3,446
Gross Amounts Offset, Assets (3,889) (1,370)
Total Net Amounts, Assets 38,446 2,076
Gross Amounts Not Offset, Assets (11,179) (2,043)
Total Net Amounts, Assets 27,267 33
Gross Amounts, Liabilities 159,777 344,619
Gross Amounts Offset, Liabilities (9,799) (551)
Total Net Amounts, Liabilities 149,978 344,068
Gross Amounts Not Offset, Liabilities (10,802) (336,645)
Total Net Amounts, Liabilities $ 139,176 $ 7,423