Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenue	$ 43,256	$ 41,069
Costs and expenses:
Operating expenses (excluding depreciation and amortization)	44,599	36,655
Corporate general and administrative	7,281	8,493
Depreciation and amortization	2,260	2,333
Research and development	2,285	2,754
Loss on disposal of long-lived assets	1,097	57
Total costs and expenses	57,522	50,292
Loss from operations	(14,266)	(9,223)
Other (expense) income:
Interest expense	(1,998)	(516)
Other income (expense), net	110	(111)
Total other expense	(1,888)	(627)
Loss before income taxes	(16,154)	(9,850)
Income tax benefit	774	322
Loss from continuing operations	(15,380)	(9,528)
Income from discontinued operations, net of tax	48,372	9,595
Net income	$ 32,992	$ 67
Basic earnings (loss) per common share:
Continuing operations (in dollars per share)	$ (0.26)	$ (0.17)
Discontinued operations, net of tax (in dollars per share)	0.83	0.17
Basic earnings (loss) per common share (in dollars per share)	0.57	0
Diluted earnings (loss) per common share:
Continuing operations (in dollars per share)	(0.26)	(0.17)
Discontinued operations, net of tax (in dollars per share)	0.83	0.17
Diluted earnings (loss) per common share (in dollars per share)	$ 0.57	$ 0
Weighted average common shares:
Weighted average common shares used in computing basic earnings (loss) per common share (in shares)	58,373	57,259
Weighted average common shares used in computing diluted earnings (loss) per common share (in shares)	58,373	57,259