Summary of Significant Accounting Policies (Accumulated Other Comprehensive Income/Loss) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (13,948)	$ (14,566)
Cumulative foreign currency translation adjustment
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss), Net of Tax	1,584	1,190
Unrecognized pension and postretirement benefit plan liabilities, net of tax
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (15,532)	$ (15,756)