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Commitments, Contingencies and Other Matters (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Reconciliation of the restructuring liability      
Balance at the beginning of the period $ 533 $ 1,875 $ 1,875
Expense Incurred 392 531 1,485
Cash Payments (254)   (2,827)
Balance at the end of the period 671   533
Short-term portion 671   533
Personnel severance and related costs
      
Reconciliation of the restructuring liability      
Expense Incurred 400 500  
2012 Restructuring
      
Reconciliation of the restructuring liability      
Balance at the beginning of the period 195 1,875 1,875
Cash Payments (109)   (1,680)
Balance at the end of the period 86   195
Short-term portion 86   195
2013 Restructuring
      
Reconciliation of the restructuring liability      
Balance at the beginning of the period 338    
Expense Incurred     1,485
Cash Payments (125)   (1,147)
Balance at the end of the period 213   338
Short-term portion 213   338
2014 Restructuring
      
Reconciliation of the restructuring liability      
Expense Incurred 392    
Cash Payments (20)    
Balance at the end of the period 372    
Short-term portion $ 372