Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Net operating loss	$ 97,920	$ 92,600
Employee benefits	3,082	2,972
Deductible goodwill and other intangibles	26,030	20,142
Other reserves	6,150	6,903
Unearned revenue	441	868
Operating lease liabilities	6,499
Other	3,242	2,000
Deferred tax assets	143,364	125,485
Valuation allowance	(84,503)	(82,833)
Deferred tax assets, net	58,861	42,652
Deferred tax liabilities:
Depreciation and amortization	(62,296)	(61,094)
Operating lease right-of-use assets	(6,017)
Deferred tax liabilities	(68,313)	(61,094)
Net deferred tax liability	$ (9,452)	$ (18,442)