Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Direct operating expenses	$ 116,449	$ 104,909	$ 119,412
Non-cash stock-based compensation	9,595	5,125	4,377
Depreciation and amortization	22,420	17,282	16,648
Related Parties
Direct operating expenses	8,412	9,063	8,194
Depreciation and amortization	1,228	1,228	1,229
Direct Operating Expenses
Non-cash stock-based compensation	3,234	1,247	732
Depreciation and amortization	14,916	12,506	11,294
Corporate Expenses
Non-cash stock-based compensation	6,361	3,878	3,645
Depreciation and amortization	491	711	658
Selling, General and Administrative Expenses
Depreciation and amortization	$ 7,013	$ 4,065	$ 4,696

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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