Consolidated Statements of Operations (Parenthetical) (Unaudited) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Direct operating expenses	$ 30,807	$ 31,694	$ 89,392	$ 93,844
Non-cash stock-based compensation			2,454	3,711
Depreciation and amortization	4,190	4,094	12,412	12,052
Related Parties
Direct operating expenses	2,048	2,175	6,017	6,431
Depreciation and amortization	306	308	921	922
Direct Operating Expenses
Non-cash stock-based compensation	74	156	324	448
Depreciation and amortization	2,888	2,504	8,350	7,606
Corporate Expenses
Non-cash stock-based compensation	745	1,130	2,130	3,263
Depreciation and amortization	168	156	483	398
Selling, General and Administrative Expenses
Depreciation and amortization	$ 1,134	$ 1,434	$ 3,579	$ 4,048

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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