Consolidated Statements of Operations (Parenthetical) (Unaudited) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Direct operating expenses	$ 29,655	$ 31,117	$ 58,585	$ 62,150
Non-cash stock-based compensation			1,635	2,425
Depreciation and amortization	4,306	4,019	8,222	7,958
Related Parties
Direct operating expenses	2,007	2,208	3,969	4,256
Depreciation and amortization	307	307	615	614
Direct Operating Expenses
Non-cash stock-based compensation	116	76	250	293
Depreciation and amortization	2,968	2,560	5,462	5,097
Corporate Expenses
Non-cash stock-based compensation	719	1,100	1,385	2,133
Depreciation and amortization	162	153	315	242
Selling, General and Administrative Expenses
Depreciation and amortization	$ 1,176	$ 1,301	$ 2,445	$ 2,614

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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