Restructuring Costs Incurred During Period, Incurred To Date and Total Expected (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		18 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 employee
Restructuring Costs [Line Items]
Expected Number of Employees Impacted by Exit Activities					170
Expected Cost Remainder of Fiscal Year and First Quarter of Succeeding Fiscal Year					$ 1,237
Restructuring costs incurred	848	615	1,659	615
Cumulative restructuring costs					7,063
Total expected restructuring costs					8,300
Employee Termination Benefits
Restructuring Costs [Line Items]
Restructuring costs incurred	234	396	629	396
Cumulative restructuring costs					3,826
Total expected restructuring costs					3,900
Other Restructuring Costs
Restructuring Costs [Line Items]
Restructuring costs incurred	614	219	1,030	219
Cumulative restructuring costs					3,237
Total expected restructuring costs					$ 4,400