CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income (loss)	$ 13,259	$ (9,183)	$ (81,391)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	49,625	51,850	56,614
Provision for doubtful accounts, notes and inventory	2,586	1,857	19,835
Stock-based compensation expense	3,880	5,307	8,123
Change in fair value of derivative instruments	5,545	(9,788)	(46)
Amortization of discount and debt issuance cost	(728)	(1,220)	847
Loss (gain) on disposal of property and equipment	(2,536)	2,554	3,105
Gain on extinguishment of debt, net			(3,195)
Gain from sale of certain assets of subsidiary	(7,455)	(4,782)	(70,658)
Asset impairments and other charges			58,061
Loss from formation of equity method investment		1,163	6,465
Loss from equity method investments	119	2,723	131
Right-of-use asset amortization	3,234
Deferred income taxes	738		(2,400)
Changes in operating assets and liabilities, net of assets and liabilities acquired and disposed:
Accounts and other receivables	(63,408)	(6,360)	6,881
Inventory	3,439	(1,065)	963
Prepaid expenses and other assets	(16,617)	1,547	6,753
Operating lease liabilities	(3,786)
Accounts payable	9,316	679	(8,964)
Deferred revenue	(3,528)	30	9,268
Accrued expenses and other	18,596	2,670	(14,709)
Net cash provided by (used in) operating activities	12,279	37,982	(4,317)
Cash flows from investing activities:
Purchases of short-term investments	(171,080)	(348,091)	(340,194)
Maturities and sales of short-term investments	180,704	425,804	272,220
Purchases of and deposits on property and equipment	(27,088)	(25,263)	(36,307)
Loans made to customers			(894)
Payments on and proceeds from sales of loans receivable	608	518	1,102
Cash received from sale of certain assets of subsidiary, net	7,582	871	149,088
Cash contributed in formation of equity method investment			(2,404)
Investments in other entities			(1,928)
Proceeds from disposal of property and equipment	7,772	530
Net cash provided by (used in) investing activities	(1,502)	54,369	40,683
Cash flows from financing activities:
Issuances of common stock	309	83,438	10,767
Fees paid for issuances of common stock, debt prepayment and debt issuance costs	(123)	(1,004)	(638)
Proceeds from debt instruments and finance lease obligations	15,294	17,243	9,765
Proceeds from revolving line of credit			312
Repayments of borrowing under revolving line of credit			(23,812)
Repayments of debt instruments and finance lease obligations	(7,795)	(194,886)	(30,707)
Payments to holders of stock options in subsidiaries			(8,850)
Net cash provided by (used in) financing activities	7,685	(95,209)	(43,163)
Effect of exchange rates on cash, cash equivalents, and restricted cash	136	274	890
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	18,598	(2,584)	(5,907)
Cash, cash equivalents and restricted cash, beginning of year	34,624	37,208	43,115
Cash, cash equivalents and restricted cash, end of year	53,222	34,624	37,208
Supplemental disclosure of cash flow information:
Income taxes paid	36	257	344
Interest paid, net of $103, $244 and $441 capitalized, respectively	$ 6,788	$ 16,751	$ 17,048