Defined Benefit Pension Plans Components of Pension Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service costs--increase in benefit obligation earned	$ 185	$ 134	$ 130
Interest cost on projected benefit obligation	1,657	1,671	1,625
Expected return on plan assets	(1,701)	(1,908)	(1,767)
Settlement loss	219	0	0
Amortization of net actuarial loss	1,041	535	615
Amortization of prior service cost	14	14	14
Amortization of transition asset	0	(68)	(69)
Net pension expense of defined benefit pension plans	1,415	378	548
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	$ 724