Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Components of Deferred Tax Assets and Liabilities [Abstract]
Allowance for doubtful accounts	$ 2,075	$ 1,333
Insurance and claims reserves	21,657	22,503
Compensation and employee benefits	3,394	2,973
Net operating loss and credit carryforwards	31,983	53,552
Net federal capital loss carryforward	4,860
Finance lease obligations	2,660	4,782
Investment in subsidiaries	151	6,660
Operating lease liabilities	67,860
Notes receivable reserve	2,639
Other	231	551
Valuation allowance	(6,393)	(5,826)	$ (3,393)	$ (3,530)
Total deferred tax assets	131,117	86,528
Property and equipment	75,014	97,073
Intangibles	7,541	8,007
Prepaid license fees	1,011	974
Right of use asset	67,958
Other	285	452
Total deferred tax liabilities	151,809	106,506
Net deferred tax liability	$ 20,692	$ 19,978