Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Balance at beginning of period	$ 397,340	$ 353,667	$ 653,046
Change in accumulated other comprehensive income (loss)	(7,045)	4,890	0
Balance at end of period	140,258	397,340	353,667
Accumulated other comprehensive income (loss) [Member]
Balance at beginning of period	4,890	0	0
Change in accumulated other comprehensive income (loss)	(7,045)	4,890
Balance at end of period	(2,155)	4,890	0
Foreign currency [Member]
Balance at beginning of period	4,890	0
Change in accumulated other comprehensive income (loss)	(7,045)	4,890
Balance at end of period	$ (2,155)	$ 4,890	$ 0