Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Accumulated other comprehensive income (loss) (Details)

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Summary of Significant Accounting Policies - Accumulated other comprehensive income (loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Other (expense) income, net    
Reclassification adjustment for losses on available-for-sale debt securities $ 2,473 $ 646