Consolidated Statements of Operations (Parenthetical) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Direct operating expenses	$ 26,561	$ 26,679
Non-cash stock-based compensation	1,071	789
Depreciation and amortization	5,184	4,512
Related Parties
Direct operating expenses	1,937	2,219
Depreciation and amortization	307	307
Direct Operating Expenses
Non-cash stock-based compensation	316	131
Depreciation and amortization	3,843	3,131
Corporate Expenses
Non-cash stock-based compensation	755	658
Depreciation and amortization	188	173
Selling, General and Administrative Expenses
Depreciation and amortization	$ 1,153	$ 1,208

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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