Equity Investment - Summary of Financial Information for Matrix (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Current assets	$ 426,616				$ 256,427				$ 426,616	$ 256,427
Current liabilities	324,752				150,186				324,752	150,186
Revenue	398,509	$ 320,619	$ 282,256	$ 367,291	384,833	$ 393,385	$ 363,911	$ 367,815
Operating income (loss)	20,936	43,334	48,843	10,045	7,554	16,987	(3,250)	3,441	123,158	24,732	$ 24,276
Net income (loss)	(3,065)	$ 38,805	$ 36,998	$ 16,098	(6,058)	$ 8,154	$ (1,712)	$ 582	88,836	966	(18,981)
Matrix
Schedule of Investments [Line Items]
Current assets	143,110				64,221				143,110	64,221
Long-term assets	619,642				631,007				619,642	631,007
Current liabilities	81,920				31,256				81,920	31,256
Long-term liabilities	$ 351,036				$ 351,380				351,036	351,380
Revenue									414,622	275,391	282,067
Operating income (loss)									39,412	(61,000)	(1,186)
Net income (loss)									$ 15,137	$ (69,353)	$ (19,962)