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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities    
Net loss $ (64,189) $ (554,609)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation expense 19,149 22,873
Amortization of intangible assets 19,934 25,621
Impairments of goodwill, intangible assets, property and equipment 20,394 532,336
Impairments of operating lease assets 14,096 2,187
Inventory write down 19,691 5,775
Stock-based compensation expense 7,726 11,923
Loss from unconsolidated subsidiary 0 317
Contingent consideration benefit 0 (4,629)
Gain on extinguishment of debt (72,478) 0
Gain realized on previously held equity investment 0 (1,567)
Deferred loan costs written off 2,262 0
Deferred income taxes 87 (1,438)
Noncash losses and other, net 3,417 3,751
Changes in operating assets and liabilities    
Accounts receivable—trade 70,175 20,515
Inventories 29,572 28,200
Prepaid expenses and other assets 651 237
Cost and estimated profit in excess of billings (2,471) 4,190
Accounts payable, deferred revenue and other accrued liabilities (60,767) (21,328)
Billings in excess of costs and estimated profits earned (5,548) 1,297
Net cash provided by operating activities 1,701 75,651
Cash flows from investing activities    
Capital expenditures for property and equipment (2,168) (12,607)
Proceeds from sale of business, property and equipment 4,187 39,805
Net cash provided by investing activities 2,019 27,198
Cash flows from financing activities    
Borrowings of debt 85,000 97,000
Repayments of debt (113,441) (217,333)
Bond exchange early participation payment (3,500) 0
Repurchases of stock (182) (1,050)
Deferred financing costs (9,358) 0
Net cash used in financing activities (41,481) (121,383)
Effect of exchange rate changes on cash (130) 190
Net decrease in cash, cash equivalents and restricted cash (37,891) (18,344)
Cash, cash equivalents and restricted cash at beginning of period 57,911 47,241
Cash, cash equivalents and restricted cash at end of period 20,020 28,897
Noncash activities    
Operating lease right of use assets obtained in exchange for lease obligations 4,382 9,603
Finance lease right of use assets obtained in exchange for lease obligations 1,401 1,478
Note receivable related to equity method investment transaction $ 0 $ 4,725