Lease Agreements - Sublease Information (Details) - USD ($) $ in Thousands  | 
3 Months Ended | 9 Months Ended | 
|---|---|---|
Sep. 30, 2019  | 
Sep. 30, 2019  | 
|
| Operating sublease information | ||
| Fixed sublease expense | $ 1,096 | $ 3,286 | 
| Variable sublease expense | 210 | 618 | 
| Sublease income | (1,306) | (3,904) | 
| Net | 
| X | ||||||||||
- Definition Amount of fixed sublease expense. No definition available. 
  | 
| X | ||||||||||
- Definition Amount of net sublease income (expense). No definition available. 
  | 
| X | ||||||||||
- References No definition available. 
  | 
| X | ||||||||||
- Definition Amount of variable sublease expense. No definition available. 
  | 
| X | ||||||||||
- Definition Amount of sublease income excluding finance and operating lease expense. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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