Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Direct operating expenses	$ 113,439	$ 110,323	$ 104,874
Non-cash stock-based compensation	5,035	5,240	4,351
Depreciation and amortization	15,342	15,989	14,663
Related Parties
Direct operating expenses	10,302	9,306	10,655
Depreciation and amortization	2,320	2,321	2,320
Direct Operating Expenses
Non-cash stock-based compensation	1,330	1,931	1,294
Depreciation and amortization	9,206	10,326	10,037
Corporate Expenses
Non-cash stock-based compensation	3,705	3,309	3,057
Depreciation and amortization	1,401	1,444	779
Selling, General and Administrative Expenses
Depreciation and amortization	$ 4,735	$ 4,219	$ 3,847