Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (3,262)	$ (456)	$ 2,072
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(2,096)	(1,618)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(710)	(910)
Other Comprehensive Income (Loss), Net of Tax	(2,806)	(2,528)	2,093
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2,906)	(3,195)	(1,834)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	289	(1,361)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Other Comprehensive Income (Loss), Net of Tax	289	(1,361)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(356)	2,739	$ 3,906
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(2,385)	(257)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(710)	(910)
Other Comprehensive Income (Loss), Net of Tax	$ (3,095)	$ (1,167)