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Derivative Financial Instruments Balance Sheet Offsetting (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Offsetting Assets and Liabilities [Line Items]    
Gross asset $ 43,630 $ 41,636
Financial Instruments (17,028) (15,358)
Cash collateral 0 0
Net asset 26,602 26,278
Gross liability 38,997 41,842
Financial Instruments (17,028) (15,358)
Cash Collateral (6,588) (4,216)
Net liability 15,381 22,268
Interest Rate Swap    
Offsetting Assets and Liabilities [Line Items]    
Gross asset 43,446 41,395
Financial Instruments (16,844) (15,117)
Cash collateral 0 0
Net asset 26,602 26,278
Gross liability 38,742 41,395
Financial Instruments (16,844) (15,117)
Cash Collateral (6,588) (4,010)
Net liability 15,310 22,268
Foreign Exchange Contract    
Offsetting Assets and Liabilities [Line Items]    
Gross asset 184 241
Financial Instruments (184) (241)
Cash collateral 0 0
Net asset 0 0
Gross liability 255 447
Financial Instruments (184) (241)
Cash Collateral 0 (206)
Net liability $ 71 $ 0