Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Net (loss) income	$ (17,740)	$ (10,277)	$ 269
Adjustments to reconcile net (loss) income including non-controlling interests to net cash provided by operating activities:
Depreciation and amortization of property and equipment	78,313	70,862	78,837
Amortization of intangible assets	4,288	4,571	3,710
Impairment loss, loss on disposal of fixed assets and intangible assets held for sale, net, and other	77	440	238
Stock-based compensation	7,606	8,596	12,268
Amortization of deferred financing costs and debt discount, net of amounts capitalized	8,173	8,412	2,261
Non-cash operating lease cost	2,320	2,350	0
Gains and amortization of premiums/discounts for marketable securities	(4)	(609)	0
Change in fair value of contingent consideration	0	(961)	0
Bad debt expense	28	181	363
Change in deferred income taxes	(9)	(80)	(5,617)
Changes in operating assets and liabilities, net effect of acquisition:
Accounts receivable	5,289	9,184	(13,702)
Prepaid expenses and other assets	(2,744)	1,233	(800)
Accounts payable	(1,693)	426	(246)
Accrued expenses and other liabilities	(5,290)	7,054	6,477
Deferred revenue	(3,134)	10,301	9,263
Operating lease liabilities	(2,932)	(2,973)	0
Net cash provided by operating activities	72,548	108,710	93,321
Cash flows from investing activities
Purchases of marketable securities	(15,032)	(81,177)	0
Proceeds from maturities of marketable securities	50,665	41,593	0
Purchases of property and equipment	(106,262)	(133,696)	(108,730)
Payments for asset and business acquisitions	0	0	(24,624)
Net cash used in investing activities	(70,629)	(173,280)	(133,354)
Cash flows from financing activities
Proceeds from Convertible Notes offering, net of issuance costs	0	0	195,716
Payment for capped call options	0	0	(23,969)
Debt issuance costs		(1,815)	(695)
Proceeds from credit facility	100,000	3,500	15,000
Principal payments on credit facility	(100,778)	(778)	(15,875)
Payments of acquisition related consideration	0	(3,027)	0
Proceeds from exercise of stock options	708	470	9,979
Repurchase of common stock for retirement	0	(747)	0
Payments of finance leases and notes payable	(4,247)	(6,608)	(6,181)
Payments of withholding tax on net issuance of restricted stock units	(1,730)	(34,420)	(10,536)
Payments to non-controlling interest	(262)	(1,003)	(614)
Net cash (used in) provided by financing activities	(6,309)	(44,428)	162,825
Effect of exchange rates on cash	100	(13)	(65)
Net (decrease) increase in cash and cash equivalents	(4,290)	(109,011)	122,727
Cash and cash equivalents at beginning of year	40,401	149,412	26,685
Cash and cash equivalents at end of year	36,111	40,401	149,412
Supplemental disclosure of cash flow information
Cash paid for interest, net of amounts capitalized	853	154	0
Cash paid for taxes, net of refunds	287	(20)	565
Supplemental disclosure of non-cash investing and financing activities
Property and equipment costs included in accounts payable, accrued expenses and other liabilities	35,125	39,037	37,275
Purchase of equipment and prepaid maintenance services under capital financing arrangements	0	0	5,068
Capitalized stock-based compensation included in property and equipment costs	645	860	789
Financed sale of intangible assets held for sale	217	290	0
Purchase price for asset and business acquisitions included in accrued expenses and other liabilities	0	0	4,913
Debt issuance costs included in accrued expenses and other liabilities	0	0	164
Tax effect on equity component of Convertible Notes	$ 0	$ 0	$ 5,686