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