Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details)

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Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details)
12 Months Ended
Dec. 31, 2018
Minimum  
Goodwill [Line Items]  
Intangible assets amortization period 1 year
Maximum  
Goodwill [Line Items]  
Intangible assets amortization period 15 years