Defined Benefit Pension Plans Change in benefit obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at beginning of year	$ 35,876	$ 31,888
Service cost	35	51	$ 222
Interest cost	1,486	1,618	1,515
Actuarial (gains)/losses	(2,445)	4,838
New longevity assumptions	(340)	3,229
Curtailments	(404)	0
Settlements	(6,186)	(4,319)
Benefits paid	(794)	(1,429)
Projected benefit obligation at end of year	27,228	35,876	$ 31,888
Accumulated benefit obligation at end of year	$ 27,228	$ 35,475