Derivative Financial Instruments Scheduel of Offsetting of Derivative Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Offsetting of Derivative Assets [Line Items]
Gross Amounts of Recognized Assets	$ 8,763	$ 3,205
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheets	8,763	3,205
Financial Instruments	(1,705)	(451)
Cash Collateral Pledged	0	0
Net Amount	7,058	2,754
Barclays [Member]
Offsetting of Derivative Assets [Line Items]
Gross Amounts of Recognized Assets		577
Gross Amounts Offset in the Consolidated Balance Sheets		0
Net Amounts of Assets Presented in the Consolidated Balance Sheets		577
Financial Instruments		(56)
Cash Collateral Pledged		0
Net Amount		521
J.P. Morgan Chase [Member]
Offsetting of Derivative Assets [Line Items]
Gross Amounts of Recognized Assets	1,492
Gross Amounts Offset in the Consolidated Balance Sheets	0
Net Amounts of Assets Presented in the Consolidated Balance Sheets	1,492
Financial Instruments	(442)
Cash Collateral Pledged	0
Net Amount	1,050
Wells Fargo Bank [Member]
Offsetting of Derivative Assets [Line Items]
Gross Amounts of Recognized Assets	7,271	2,628
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheets	7,271	2,628
Financial Instruments	(1,263)	(395)
Cash Collateral Pledged	0	0
Net Amount	$ 6,008	$ 2,233