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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities    
Net income (loss) $ (7,888) $ 28,066
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation expense 7,513 8,158
Amortization of intangible assets 8,846 10,500
Inventory write down 377 2,455
Stock-based compensation expense 3,910 5,302
Loss from unconsolidated subsidiary 849 963
Contingent consideration benefit (4,629) 0
Gain on contribution of subsea rentals business 0 (33,506)
Deferred income taxes (1,021) (2,735)
Noncash losses (gains) and other, net 4,847 531
Changes in operating assets and liabilities    
Accounts receivable—trade 684 3,034
Inventories 6,948 (27,363)
Prepaid expenses and other assets (3,031) (16,770)
Cost and estimated profit in excess of billings 1,015 (3,420)
Accounts payable, deferred revenue and other accrued liabilities 1,251 6,528
Billings in excess of costs and estimated profits earned (1,784) (1,065)
Net cash provided by (used in) operating activities 17,887 (19,322)
Cash flows from investing activities    
Capital expenditures for property and equipment (3,687) (5,080)
Proceeds from sale of business, property and equipment 134 5,074
Net cash used in investing activities (3,553) (6)
Cash flows from financing activities    
Borrowings of debt 20,000 0
Repayments of debt (51,063) (50,729)
Repurchases of stock (973) (1,946)
Net cash used in financing activities (32,036) (52,675)
Effect of exchange rate changes on cash 155 (873)
Net decrease in cash, cash equivalents and restricted cash (17,547) (72,876)
Cash, cash equivalents and restricted cash at beginning of period 47,241 115,216
Cash, cash equivalents and restricted cash at end of period 29,694 42,340
Noncash activities (1)    
Assets contributed for equity method investment [1] 0 18,070
Note receivable related to equity method investment transaction [1] $ 0 $ 4,067
[1] See Note 8 Leases for additional information noncash activities related to leases and the impact from adoption of ASU 842.