Commitments and Contingencies - Self-Insurance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Gain Contingencies [Line Items]
Limit excess policy	$ 10,000	$ 10,000
Claims made in excess amount	$ 2,000	1,000
Percent of paid claims	15.00%
Claims made in excess amount due	$ 2,000	1,000
Auto Liability and General Liability Insurances
Gain Contingencies [Line Items]
Self insurance reserve basic coverage	2,000	250
Employee Group Medical Plan
Gain Contingencies [Line Items]
Self insurance reserve basic coverage	150
Self insurance reserve	$ 7,000	$ 5,200
Minimum
Gain Contingencies [Line Items]
Percent of paid claims		15.00%
Maximum
Gain Contingencies [Line Items]
Percent of paid claims		17.00%