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, 2015
Dec. 31, 2014
Fair Value Disclosures [Abstract]    
Gross Amounts, Assets $ 3,446  
Gross Amounts Offset, Assets (1,370)  
Total Net Amounts, Assets 2,076  
Gross Amounts Not Offset, Assets (2,043)  
Total Net Amounts, Assets 33  
Gross Amounts, Liabilities 344,619 $ 247,577
Gross Amounts Offset, Liabilities (551) (190)
Total Net Amounts, Liabilities 344,068 247,387
Gross Amounts Not Offset, Liabilities (336,645) (59,023)
Total Net Amounts, Liabilities $ 7,423 $ 188,364