Consolidated Statements of Operations (Parenthetical) (Unaudited) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Direct operating expenses	$ 31,694	$ 30,231	$ 93,844	$ 87,238
Non-cash stock-based compensation			3,711	3,149
Depreciation and amortization	4,094	4,337	12,052	12,460
Related Parties
Direct operating expenses	2,175	2,404	6,431	7,116
Depreciation and amortization	308	580	922	1,741
Direct Operating Expenses
Non-cash stock-based compensation	156	276	448	806
Depreciation and amortization	2,504	2,221	7,606	6,825
Corporate Expenses
Non-cash stock-based compensation	1,130	813	3,263	2,343
Depreciation and amortization	156	318	398	972
Selling, General and Administrative Expenses
Depreciation and amortization	$ 1,434	$ 1,798	$ 4,048	$ 4,663

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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