Consolidated Statements of Operations (Parenthetical) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Direct operating expenses	$ 26,679	$ 28,930
Non-cash stock-based compensation	789	800
Depreciation and amortization	4,512	3,916
Related Parties
Direct operating expenses	2,219	1,962
Depreciation and amortization	307	308
Direct Operating Expenses
Non-cash stock-based compensation	131	134
Depreciation and amortization	3,131	2,494
Corporate Expenses
Non-cash stock-based compensation	658	666
Depreciation and amortization	173	153
Selling, General and Administrative Expenses
Depreciation and amortization	$ 1,208	$ 1,269

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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