Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Change in Projected Benefit Obligation
Projected benefit obligation, beginning of period	$ 28,624	$ 25,935	$ 25,935
Service cost	250	249	995
Interest cost	307	289	1,155
Actuarial loss	0		1,031
Benefits paid	(131)		(492)
Projected benefit obligation, end of period	29,050		28,624
Change in Plan Assets
Plan assets at fair value, beginning of period	0	$ 0	0
Company contributions	131		492
Benefits paid	(131)		(492)
Plan assets at fair value, end of period	0		0
Unfunded Status of the Plan	$ (29,050)		$ (28,624)