Basis of Presentation and Significant Accounting Policies - Realized and Unrealized Foreign Currency Gains and Losses (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Realized foreign currency loss	$ 575	$ 734	$ 889
Unrealized foreign currency (gain) loss	$ (381)	$ 124	$ 36

Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement.

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