Restructuring Charges Restructuring Charges (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended				3 Months Ended	6 Months Ended
	Sep. 30, 2012 position	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Asset Related and Other Costs [Member]	Jun. 30, 2013 Asset Related and Other Costs [Member]	Jun. 30, 2014 Employee Separation Costs	Jun. 30, 2014 Employee Separation Costs	Jun. 30, 2013 Employee Separation Costs
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated	160
Costs incurred and charged to expense		$ 1,757	$ 2,198	$ 0	$ 380		$ 1,757	$ 1,818
Restructuring Reserve [Roll Forward]
Accrued liability beginning balance							756
Costs incurred and charged to expense, excluding non-cash charges						1,757
Cash payments						(2,263)
Accrued liability ending balance						$ 250	$ 250