Derivative Financial Instruments Schedule of Offsetting of Derivate Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	$ 1,705	$ 451
Gorss Amount Offset in the Consolidated Balance Sheets	0	0
Net Amounts of LIabilities Presented in the Consolidated Balance Sheets	1,705	451
Financial Instruments	(1,705)	(451)
Cash Collateral Pledged	0	0
Net Amounts	0	0
Barclays [Member]
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities		56
Gorss Amount Offset in the Consolidated Balance Sheets		0
Net Amounts of LIabilities Presented in the Consolidated Balance Sheets		56
Financial Instruments		(56)
Cash Collateral Pledged		0
Net Amounts		0
J.P. Morgan Chase [Member]
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	442
Gorss Amount Offset in the Consolidated Balance Sheets	0
Net Amounts of LIabilities Presented in the Consolidated Balance Sheets	442
Financial Instruments	(442)
Cash Collateral Pledged	0
Net Amounts	0
Wells Fargo Bank [Member]
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	1,263	395
Gorss Amount Offset in the Consolidated Balance Sheets	0	0
Net Amounts of LIabilities Presented in the Consolidated Balance Sheets	1,263	395
Financial Instruments	(1,263)	(395)
Cash Collateral Pledged	0	0
Net Amounts	$ 0	$ 0