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Segments and Major Customers (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	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
Financial information of business segments
Revenue from Contract with Customer, Including Assessed Tax	$ 68,563	$ 59,754	$ 56,458	$ 46,426	$ 101,891	$ 99,134	$ 94,720	$ 97,351	$ 231,201	$ 393,096	$ 336,597
Segment operating expenses									162,736	169,914	150,712
Segment operating income (loss)									68,465	223,182	185,885
Reconciling items									(155,432)	(168,775)	(152,243)
Operating income (loss)	$ (4,200)	$ (19,167)	$ (19,987)	$ (43,613)	$ 15,719	$ 17,010	$ 8,244	$ 13,434	(86,967)	54,407	33,642
Interest and other income (expense), net									16,339	(13,418)	(11,005)
Income before income taxes									(70,628)	40,989	22,637
MID
Financial information of business segments
Revenue from Contract with Customer, Including Assessed Tax									168,528	280,704	239,843
Segment operating expenses									94,999	86,044	68,460
Segment operating income (loss)									73,529	194,660	171,383
RSD
Financial information of business segments
Revenue from Contract with Customer, Including Assessed Tax									60,232	96,663	76,175
Segment operating expenses									53,177	50,010	51,855
Segment operating income (loss)									7,055	46,653	24,320
Other
Financial information of business segments
Revenue from Contract with Customer, Including Assessed Tax									2,441	15,729	20,579
Segment operating expenses									14,560	33,860	30,397
Segment operating income (loss)									$ (12,119)	$ (18,131)	$ (9,818)

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