Equity Investment - Summary of Financial Information for Matrix (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Schedule of Investments [Line Items]
Current assets	$ 245,880				$ 245,880		$ 256,427
Current liabilities	201,314				201,314		150,186
Service revenue, net	282,256		$ 363,911		649,547	$ 731,726
Operating income	48,843		(3,250)		58,888	191
Net income (loss)	36,998	$ 16,098	(1,712)	$ 582	53,096	(1,129)
Matrix
Schedule of Investments [Line Items]
Current assets	97,897				97,897		64,221
Long-term assets	630,009				630,009		631,007
Current liabilities	49,852				49,852		31,256
Long-term liabilities	361,529				361,529		$ 351,380
Service revenue, net	90,667		72,161		151,971	139,144
Operating income	15,258		1,543		13,585	2,098
Net income (loss)	$ 8,892		$ (3,661)		$ 2,535	$ (8,148)