CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net (loss) income	$ (50,085)	$ (401,732)	$ 4,136
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities
Depreciation and amortization	92,458	101,672	120,669
Net loss on disposal of property and equipment and divestitures	2,068	2,405	7,950
Equity in losses of unconsolidated entities	279
Bad debt (recovery) expense	(139)	6,373	2,553
Amortization of debt issuance costs	688	688	688
Inventory write-downs	239	852	250
Equity-based compensation	9,469	5,764	15,485
Impairment of goodwill and trademark		276,016	4,396
Impairment and abandonment of property and equipment		7,910	3,715
Bargain purchase gain	(18,985)
Loss on divestitures		410	3,676
Unrealized loss (gain) on short-term investment	2,044	(1,799)
Other operating items, net	(1,795)	(407)	240
Changes in operating assets and liabilities
Accounts receivable	(80,127)	142,873	57,908
Prepaid expenses and other assets	(15,108)	14,886	11,321
Accounts payable and accrued liabilities	42,746	(50,101)	(29,039)
Net cash (used in) provided by operating activities	(16,248)	105,810	203,948
Cash flows from investing activities
Working capital settlement			691
Proceeds from sale of securities	730
Proceeds received from divestitures		197	24,872
Purchase of property and equipment	(39,994)	(21,239)	(110,143)
Investment in note receivable	(1,101)	(3,000)
Purchase of equity method investments	(2,200)
Collection of note receivable	167
Distribution from cost method investment	180	200
Acquisitions, net of cash received	(34,740)		(10,000)
Proceeds received from sales of property and equipment	12,502	18,449	17,223
Net cash used in investing activities	(64,456)	(5,393)	(77,357)
Cash flows from financing activities
Borrowings from revolving line of credit			5,000
Payments on long-term debt			(50,000)
Payments of finance lease obligations	(320)	(264)	(883)
Proceeds from share issuance	58	76	142
(Distributions to) contributions from noncontrolling interests	(1,074)	354	(349)
Repurchase of common stock	(1,206)	(10,876)	(18,600)
Net cash used in financing activities	(2,542)	(10,710)	(64,690)
Effect of exchange rate changes on cash	8	64	130
Net (decrease) increase in cash and cash equivalents	(83,238)	89,771	62,031
Cash and cash equivalents, beginning of period	169,039	79,268	17,237
Cash and cash equivalents, end of period	85,801	169,039	79,268
Supplemental cash flow disclosure:
Cash paid for interest	1,488	1,838	2,716
Cash (refunds received) paid for income taxes, net	(887)	(174)	1,793
Supplemental disclosure of noncash operating activities:
Noncash settlement of accounts receivable		1,578
Lease liabilities arising from obtaining right-of-use assets	8,665	9,322	119,358
Supplemental disclosure of noncash investing activities:
Issuance of shares for acquisitions	32,123
Capital expenditures included in accounts payable and accrued liabilities	$ 12,120	5,733	$ 10,472
Noncash proceeds received from sale of interest in a formerly consolidated joint venture		$ 367