Defined Benefit Pension Plans Change in benefit obligation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at beginning of year	$ 36,045	$ 32,148
Service cost	222	185	134
Interest cost	1,515	1,657	1,671
Actuarial (gains)/losses	(4,272)	4,604
Settlements	0	(356)
Benefits paid	(1,622)	(2,193)
Projected benefit obligation at end of year	31,888	36,045	32,148
Accumulated benefit obligation at end of year	$ 31,599	$ 35,790