Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Direct operating expenses	$ 119,412	$ 125,242	$ 119,283
Non-cash stock-based compensation	4,377	5,787	6,091
Depreciation and amortization	16,648	16,273	16,411
Related Parties
Direct operating expenses	8,194	9,254	9,494
Depreciation and amortization	1,229	1,228	2,043
Direct Operating Expenses
Non-cash stock-based compensation	732	732	1,236
Depreciation and amortization	11,294	10,272	8,861
Corporate Expenses
Non-cash stock-based compensation	3,645	5,055	4,855
Depreciation and amortization	658	551	1,203
Selling, General and Administrative Expenses
Depreciation and amortization	$ 4,696	$ 5,450	$ 6,347

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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