Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Change in Projected Benefit Obligation
Projected benefit obligation, beginning of period			$ 25,935	$ 25,826	$ 25,826
Service cost	$ 249	$ 293	746	860	1,173
Interest cost	289	$ 271	866	812	1,082
Actuarial gain			0		(1,818)
Benefits paid			(339)		(328)
Projected benefit obligation, end of period	27,208		27,208		25,935
Change in Plan Assets
Plan assets at fair value, beginning of period			0	$ 0	0
Company contributions			339		328
Benefits paid			(339)		(328)
Plan assets at fair value, end of period	0		0		0
Unfunded Status of the Plan	$ (27,208)		$ (27,208)		$ (25,935)