Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Net operating loss	$ 102,650	$ 97,920
Employee benefits	2,269	2,877
Deductible goodwill and other intangibles	55,471	50,024
Land	2,637	2,352
Other reserves	6,701	6,644
Unearned revenue	114	441
Operating lease liabilities	6,027	6,453
Capital losses	1,343	1,056
Other	1,559	2,028
Deferred tax assets	178,771	169,795
Valuation allowance	(88,251)	(84,503)
Deferred tax assets, net	90,520	85,292
Deferred tax liabilities:
Intangibles	(24,359)	(26,242)
Depreciation	(58,329)	(62,524)
Operating lease right-of-use assets	(5,599)	(5,978)
Deferred tax liabilities	(88,287)	(94,744)
Net deferred tax assets, net	$ 2,233
Net deferred tax liabilities, net		$ (9,452)