Restructuring Costs (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2014
employee
Dec. 31, 2013
Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Activities, Initiation Date     Aug. 19, 2013    
Restructuring and Related Cost, Number of Positions Eliminated     57    
Lease Expiration Date     Jul. 31, 2015    
Restructuring costs $ 975,000 $ 900,000 $ 1,907,000 $ 5,753,000 $ 0
Impairment of intangible assets and prepaid royalties     700,000    
Change in prior estimate     1,907,000    
Restructuring Reserve, Current     1,200,000    
Facility Closing [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring costs     2,400,000    
Change in prior estimate     1,936,000    
Other Restructuring [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring costs     1,700,000    
Employee Severance [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring costs     1,000,000    
Change in prior estimate     $ (29,000)