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
Mar. 31, 2017
Dec. 31, 2016
Fair Value Disclosures [Abstract]    
Gross Amounts, Assets $ 11,855 $ 20,302
Gross Amounts Offset, Assets
Total Net Amounts, Assets 11,855 20,302
Gross Amounts Not Offset, Assets (225) (14)
Total Net Amounts, Assets 11,630 20,288
Gross Amounts, Liabilities 223,492 238,069
Gross Amounts Offset, Liabilities (8,449) (13,237)
Total Net Amounts, Liabilities 215,043 224,832
Gross Amounts Not Offset, Liabilities (135,672) (155,190)
Total Net Amounts, Liabilities $ 79,371 $ 69,642