Derivative Financial Instruments Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Offsetting Assets and Liabilities [Line Items]
Gross asset	$ 33,398	$ 20,360
Financial Instruments	(202)	(652)
Cash collateral	0	0
Net asset	33,196	19,708
Gross liability	33,117	20,790
Financial Instruments	(202)	(652)
Cash Collateral	(31,130)	(19,520)
Net liability	1,785	618
Interest Rate Swap
Offsetting Assets and Liabilities [Line Items]
Gross asset	32,970	19,914
Financial Instruments	(55)	(206)
Cash collateral	0	0
Net asset	32,915	19,708
Gross liability	32,970	19,914
Financial Instruments	(55)	(206)
Cash Collateral	(31,130)	(19,210)
Net liability	1,785	498
Foreign Exchange Contract
Offsetting Assets and Liabilities [Line Items]
Gross asset	428	446
Financial Instruments	(147)	(446)
Cash collateral	0	0
Net asset	281	0
Gross liability	147	876
Financial Instruments	(147)	(446)
Cash Collateral	0	(310)
Net liability	$ 0	$ 120