Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ 58	$ 100
Accumulated other comprehensive income (loss)	(619)	(1,199)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gain (loss) in accumulated other comprehensive gain (loss)	53	(377)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gain (loss) in accumulated other comprehensive gain (loss)	527	317
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss)	$ 580	$ (60)