Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Direct operating expenses	$ 104,909	$ 119,412	$ 125,242
Non-cash stock-based compensation	5,125	4,377	5,787
Depreciation and amortization	17,282	16,648	16,273
Related Parties
Direct operating expenses	9,063	8,194	9,254
Depreciation and amortization	1,228	1,229	1,228
Direct Operating Expenses
Non-cash stock-based compensation	1,247	732	732
Depreciation and amortization	12,506	11,294	10,272
Corporate Expenses
Non-cash stock-based compensation	3,878	3,645	5,055
Depreciation and amortization	711	658	551
Selling, General and Administrative Expenses
Depreciation and amortization	$ 4,065	$ 4,696	$ 5,450

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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