Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 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	497	586	1,173
Interest cost	289	$ 271	578	541	1,082
Actuarial gain			0		(1,818)
Benefits paid			(168)		(328)
Projected benefit obligation, end of period	26,842		26,842		25,935
Change in Plan Assets
Plan assets at fair value, beginning of period			0	$ 0	0
Company contributions			168		328
Benefits paid			(168)		(328)
Plan assets at fair value, end of period	0		0		0
Unfunded Status of the Plan	$ (26,842)		$ (26,842)		$ (25,935)