Defined Benefit Pension Plans Amounts reported in accumulated other comprehensive income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Amounts reported in accumulated other comprehensive income
Unrecognized net actuarial loss, Pretax	$ 9,942	$ 17,636
Unrecognized net actuarial loss, net of tax	5,995	10,577
Unrecognized prior service cost, pretax	69	82
Unrecognized prior service cost, net of tax	45	49
Amounts reported in accumulated other comprehensive income, pretax	10,011	17,718
Amounts reported in accumulated other comprehensive income, net of tax	6,040	10,626
Amortization of Costs Expected to be Recognized Next Year
Unrecognized net actuarial loss, pretax	708
Unrecognized net actuarial loss, net of tax	425
Unrecognized prior service cost, pretax	14
Unrecognized prior service cost, net of tax	8
Amortiztion of costs expected to be recognized next year, pretax	722
Amortization of costs expected to be recognized next year, net of tax	433
For pension plans with accumulated benefit obligations in excess of plan assets
Projected benefit obligation	31,888	36,045	32,148
Accumulated benefit obligation	31,599	35,790
Fair value of plan assets	$ 25,754	$ 22,957	$ 22,078