Annual report pursuant to Section 13 and 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
Dec. 31, 2016
Dec. 31, 2015
Fair Value Disclosures [Abstract]    
Gross Amounts, Assets $ 20,302 $ 3,446
Gross Amounts Offset, Assets (1,370)
Total Net Amounts, Assets 20,302 2,076
Gross Amounts Not Offset, Assets (14) (2,043)
Total Net Amounts, Assets 20,288 33
Gross Amounts, Liabilities 238,069 344,619
Gross Amounts Offset, Liabilities (13,237) (551)
Total Net Amounts, Liabilities 224,832 344,068
Gross Amounts Not Offset, Liabilities (155,190) (336,645)
Total Net Amounts, Liabilities $ 69,642 $ 7,423