Summary of Significant Accounting Policies - Leases (Details) |
12 Months Ended |
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Dec. 31, 2018
USD ($)
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| Operating leases | |
| Lease expense | $ 3,399,000 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of operating lease expense. Excludes sublease income. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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