Segments and Related Information - Financial Information by Geographic Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	$ 238,361	$ 263,697	$ 264,685	$ 250,611	$ 274,118	$ 274,594	$ 285,845	$ 253,576	$ 1,017,354	$ 1,088,133	$ 670,627
Long-lived assets	1,411,990				1,473,557				1,411,990	1,473,557	843,499
United States
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers									831,317	930,151	548,854
Long-lived assets	1,237,512				1,304,494				1,237,512	1,304,494	660,271
United Kingdom
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers									70,641	64,564	59,909
Long-lived assets	81,855				74,472				81,855	74,472	80,189
Singapore
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers									56,170	37,938	23,398
Long-lived assets	23,433				24,118				23,433	24,118	25,930
Other
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers									59,226	55,480	38,466
Long-lived assets	$ 69,190				$ 70,473				$ 69,190	$ 70,473	$ 77,109