Discontinued Operations and Held For Sale - Summary of Net Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
	Aug. 06, 2018	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Costs and expenses:
Income (loss) from discontinued operations										$ 18,873	$ 10,313	$ (6,209)
Gain on sale of CBR business										87,076	0	0
Income tax expense (benefit)										2,371	4,388	(1,633)
Net income (loss) from discontinued operations		$ (1,531)	$ 95,517	$ 5,736	$ 3,856	$ 2,722	$ 3,652	$ 186	$ (635)	103,578	5,925	(4,576)
CBR business | Discontinued Operations, Held-for-sale or Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Service revenues, net										71,217	114,177	99,604
Costs and expenses:
Cost of services										12,559	21,817	20,575
Research and development expenses										0	0	523
Selling, general and administrative expenses										39,899	81,782	80,402
Impairment of intangible assets										0	0	3,939
Restructuring expenses										0	0	374
Total costs and expenses										52,458	103,599	105,813
Operating income (loss)										18,759	10,578	(6,209)
Other income (expense)										114	(265)	0
Income (loss) from discontinued operations										18,873	10,313	(6,209)
Gain on sale of CBR business	$ 87,100									87,076	0	0
Income tax expense (benefit)										2,371	4,388	(1,633)
Net income (loss) from discontinued operations										$ 103,578	$ 5,925	$ (4,576)