Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities
Net loss	$ (10,954)	$ (5,010)
Adjustments to reconcile net loss including non-controlling interests to net cash provided by operating activities:
Depreciation and amortization of property and equipment	38,175	35,883
Amortization of intangible assets	2,216	2,262
Impairment loss, loss on disposal of fixed assets and intangible assets held for sale, net, and other	42	352
Stock-based compensation	3,517	4,380
Amortization of deferred financing costs and debt discount, net of amounts capitalized	4,877	4,381
Non-cash operating lease cost	1,207	1,045
Gains and amortization of premiums/discounts for marketable securitie	(79)	(425)
Change in deferred income taxes	(12)	0
Changes in operating assets and liabilities:
Accounts receivable	10,732	(31,350)
Prepaid expenses and other assets	(2,344)	(376)
Accounts payable	(117)	95
Accrued expenses and other liabilities	(4,590)	3,661
Deferred revenue	5,539	19,521
Operating lease liabilities	(1,520)	(1,447)
Net cash provided by operating activities	46,689	32,972
Cash flows from investing activities
Purchases of marketable securities	(15,032)	(55,629)
Proceeds from maturities of marketable securities	35,265	13,300
Purchases of property and equipment	(51,681)	(73,852)
Net cash used in investing activities	(31,448)	(116,181)
Cash flows from financing activities
Debt issuance costs	0	(1,815)
Proceeds from credit facility	100,000	3,500
Principal payments on credit facility	(389)	(389)
Payments of acquisition related consideration	0	(1,952)
Proceeds from exercise of stock options	447	80
Payments of finance leases and notes payable	(2,418)	(3,586)
Payments of withholding tax on net issuance of restricted stock units	(933)	(33,666)
Payments to non-controlling interest	(262)	(1,003)
Net cash provided by (used in) financing activities	96,445	(38,831)
Effect of exchange rates on cash	(140)	9
Net increase (decrease) in cash and cash equivalents	111,546	(122,031)
Cash and cash equivalents at beginning of period	40,401	149,412
Cash and cash equivalents at end of period	151,947	27,381
Supplemental disclosure of non-cash investing and financing activities
Property and equipment costs included in accounts payable, accrued expenses and other liabilities	38,610	34,777
Capitalized stock-based compensation included in property and equipment costs	316	465
Purchase price for business acquisition included in accrued expenses and other liabilities	0	2,961
Financed sale of intangible assets held for sale	$ 255	$ 299