Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Principles (Stock-Based Compensation) (Details)

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Summary of Significant Accounting Principles (Stock-Based Compensation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]      
Stock-based compensation expense $ 24,897 $ 28,207 $ 26,583