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
Jun. 30, 2016
Dec. 31, 2015
Fair Value Disclosures [Abstract]    
Gross Amounts, Assets $ 31,768 $ 3,446
Gross Amounts Offset, Assets (3,800) (1,370)
Total Net Amounts, Assets 27,968 2,076
Gross Amounts Not Offset, Assets (2,715) (2,043)
Total Net Amounts, Assets 25,253 33
Gross Amounts, Liabilities 206,099 344,619
Gross Amounts Offset, Liabilities (9,885) (551)
Total Net Amounts, Liabilities 196,214 344,068
Gross Amounts Not Offset, Liabilities (30,707) (336,645)
Total Net Amounts, Liabilities $ 165,507 $ 7,423