Quarterly report pursuant to Section 13 or 15(d)

Restructuring Charges - Summary of Restructuring Charges (Details)

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Restructuring Charges - Summary of Restructuring Charges (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Change in activity of restructuring reserves during the period        
Additions $ 0 $ 51 $ 0 $ 969
2013 Restructuring Plan | Severance and retention        
Change in activity of restructuring reserves during the period        
Opening balance     134 1,570
Additions     0 969
Payments     (134) (2,271)
Ending balance $ 0 $ 268 $ 0 $ 268