Income Taxes - Reconciliation of Beginning and Ending Amount of Consolidated Liability for Unrecognized Income Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 2,903	$ 3,437	$ 7,417
Additions for tax positions related to current year	456	454	769
Settlements due to lapse of time	(821)	(988)	(4,834)
Foreign currency translation effect	0	0	85
Balance at December 31	$ 2,538	$ 2,903	$ 3,437