| Restructuring (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
| Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | |
| Restructuring Reserve [Roll Forward] | ||||
| Restructuring reserve, beginning of period | $ 0 | |||
| Expense | 2,606 | 0 | 2,606 | 0 | 
| Payments | (1,180) | |||
| Restructuring reserve, end of period | 1,426 | 1,426 | ||
| Termination benefits | ||||
| Restructuring Reserve [Roll Forward] | ||||
| Restructuring reserve, beginning of period | 0 | |||
| Expense | 2,029 | |||
| Payments | (973) | |||
| Restructuring reserve, end of period | 1,056 | 1,056 | ||
| Leases and other contractual obligations | ||||
| Restructuring Reserve [Roll Forward] | ||||
| Restructuring reserve, beginning of period | 0 | |||
| Expense | 336 | |||
| Payments | (207) | |||
| Restructuring reserve, end of period | 129 | 129 | ||
| Other | ||||
| Restructuring Reserve [Roll Forward] | ||||
| Restructuring reserve, beginning of period | 0 | |||
| Expense | 241 | |||
| Payments | 0 | |||
| Restructuring reserve, end of period | $ 241 | $ 241 | ||