CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities attributable to continuing operations:
Net (loss) income and comprehensive (loss) income	$ 21,190	$ (39,999)
Less: Loss from discontinued operations, net of tax	3,516	25,550
Income (loss) from continuing operations	24,706	(14,449)
Adjustments to reconcile income (loss) from continuing operations to net cash provided by operating activities attributable to continuing operations:
Loss on impairments and disposal of assets	2,651	686
Amortization of intangibles	32,967	40,603
Depreciation	12,969	10,463
Non-cash compensation expense	51,804	39,236
Deferred income taxes	(455)	(15,489)
Change in fair value of contingent consideration	(8,249)	7,711
Unrealized gain on investments	(40,072)	0
Bad debt expense	1,823	1,314
Amortization of debt issuance costs	3,756	2,241
Write-off of previously-capitalized debt issuance costs	1,066	0
Amortization of debt discount	22,297	12,429
Loss on extinguishment of debt	0	7,768
Reduction in carrying amount of ROU asset, offset by change in operating lease liabilities	13,015	2,490
Changes in current assets and liabilities:
Accounts receivable	(43,688)	15,541
Prepaid and other current assets	(2,762)	(335)
Accounts payable, accrued expenses and other current liabilities	7,537	(9,733)
Current contingent consideration	0	(2,670)
Income taxes receivable	10,322	65
Other, net	(794)	(1,655)
Net cash provided by operating activities attributable to continuing operations	88,893	96,216
Cash flows from investing activities attributable to continuing operations:
Capital expenditures	(30,515)	(20,386)
Equity investment	(1,180)	(80,000)
Net cash used in investing activities attributable to continuing operations	(31,695)	(100,386)
Cash flows from financing activities attributable to continuing operations:
Payments related to net-share settlement of stock-based compensation, net of proceeds from exercise of stock options	(6,666)	(1,421)
Proceeds from the issuance of 0.50% Convertible Senior Notes	0	575,000
Repurchase of 0.625% Convertible Senior Notes	0	(233,862)
Payment for convertible note hedge on the 0.50% Convertible Senior Notes	0	(124,200)
Termination of convertible note hedge on the 0.625% Convertible Senior Notes	0	109,881
Proceeds from the sale of warrants related to the 0.50% Convertible Senior Notes	0	61,180
Termination of warrants related to the 0.625% Convertible Senior Notes	0	(94,292)
Net repayment of revolving credit facility	0	(75,000)
Payment of debt issuance costs	(5,995)	(16,398)
Payment of original issue discount on undrawn term loan	(2,500)	0
Contingent consideration payments	0	(3,330)
Other financing activities	(31)	(183)
Net cash (used in) provided by financing activities attributable to continuing operations	(15,192)	197,375
Total cash provided by continuing operations	42,006	193,205
Net cash provided by (used in) operating activities attributable to discontinued operations	3,330	(66,171)
Total cash provided by (used in) discontinued operations	3,330	(66,171)
Net increase in cash, cash equivalents, restricted cash and restricted cash equivalents	45,336	127,034
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of period	170,049	60,339
Cash, cash equivalents, restricted cash and restricted cash equivalents at end of period	$ 215,385	$ 187,373