Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net (loss) income	$ (205,052)	$ (229,102)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of capitalized contract costs	212,276	193,302
Amortization of customer relationships	37,255	42,134
Depreciation and amortization of property, plant and equipment and other intangible assets	16,194	15,695
Amortization of deferred financing costs and bond premiums and discounts	2,339	2,671
Gain on fair value changes of equity securities	(2,254)	(740)
Loss (gain) on sale or disposal of assets	441	(50,193)
Loss on early extinguishment of debt	806	0
Stock-based compensation	1,834	542
Provision for doubtful accounts	11,636	8,409
Changes in operating assets and liabilities:
Accounts and notes receivable, net	(29,845)	(21,069)
Inventories	(88,674)	11,641
Prepaid expenses and other current assets	(5,534)	(1,753)
Capitalized contract costs, net	(264,554)	(266,251)
Long-term notes receivables, other assets, net and right-of-use assets	(1,938)	(20,359)
Accounts payable	66,534	4,214
Accrued payroll and commissions, accrued expenses, other current and long-term liabilities, and current and long-term operating lease liabilities	26,279	65,525
Deferred revenue	91,719	114,345
Net cash used in operating activities	(130,990)	(130,989)
Cash flows from investing activities:
Capital expenditures	(4,653)	(12,193)
Proceeds from the sale of intangible assets	0	53,693
Proceeds from the sale of capital assets	19	225
Acquisition of intangible assets	(668)	(1,022)
Proceeds from sales of equity securities	5,430	0
Net cash provided by investing activities	128	40,703
Cash flows from financing activities:
Proceeds from notes payable	225,000	0
Repayment of notes payable	(229,050)	0
Borrowings from revolving credit facility	160,000	179,000
Repayments on revolving credit facility	(26,000)	(79,000)
Repayments of finance lease obligations	(4,263)	(6,955)
Deferred financing costs	(4,036)	0
Return of capital	(441)	(2,049)
Net cash provided by financing activities	121,210	90,996
Effect of exchange rate changes on cash	12	(62)
Net (decrease) increase in cash and cash equivalents	(9,640)	648
Cash and cash equivalents:
Beginning of period	12,773	3,872
End of period	3,133	4,520
Supplemental non-cash investing and financing activities:
Finance lease additions	1,567	4,137
Intangible assets acquisitions included within accounts payable, accrued expenses and other current liabilities and other long-term obligations	2,186	513
Capital expenditures included within accounts payable	$ 1,853	$ 2,482