Income Taxes - Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 6,591	$ 6,881
Additions based on tax positions related to the current year	488	749
Additions for tax positions of prior years	0	1,292
Reductions for tax positions of prior years - Settlement	(300)	(1,571)
Reduction for tax positions of prior years - Statute of limitations	0	(760)
Balance at end of year	$ 6,779	$ 6,591