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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Operating Activities:    
Net income (loss) $ 86,599 $ (32,990)
Non-cash items included in net income (loss):    
Depreciation 27,880 30,193
Amortization 35,445 33,959
Stock-based compensation 14,261 15,575
Deferred income tax benefit (27,270) (10,224)
Losses from equity method investments 20,072 19,382
Gain on acquisition of Caisson Interventional, LLC (39,428) 0
Impairment of property, plant and equipment 4,581 0
Amortization of income taxes payable on inter-company transfers of property 23,831 17,114
Other 3,364 8,765
Changes in operating assets and liabilities:    
Accounts receivable, net (19,107) (11,040)
Inventories (11,006) 20,607
Other current and non-current assets (17,846) (25,845)
Restructuring reserve (12,753) 14,961
Accounts payable and accrued current and non-current liabilities (14,958) (31,109)
Net cash provided by operating activities 73,665 49,348
Investing Activities:    
Purchases of property, plant and equipment and other (24,004) (28,928)
Acquisition of Caisson Interventional, LLC, net of cash acquired (14,194) 0
Proceeds from sale of cost method investment 3,192 0
Proceeds from asset sales 5,346 222
Purchases of cost and equity method investments (5,209) (8,059)
Loans to cost and equity method investees (6,928) (6,595)
Purchases of short-term investments 0 (7,054)
Maturities of short-term investments 0 14,051
Net cash used in investing activities (41,797) (36,363)
Financing Activities:    
Change in short-term borrowing, net (18,054) (33,831)
Proceeds from short-term borrowing (maturities greater than 90 days) 20,000 0
Repayment of long-term debt obligations (11,615) (11,354)
Proceeds from exercise of stock options 3,221 7,888
Repayment of trade receivable advances 0 (23,848)
Proceeds from long-term debt obligations 0 7,994
Share repurchases 0 (11,053)
Other (3,552) 1,208
Net cash used in financing activities (10,000) (62,996)
Effect of exchange rate changes on cash and cash equivalents 3,501 1,030
Net increase (decrease) in cash and cash equivalents 25,369 (48,981)
Cash and cash equivalents at beginning of period 39,789 112,613
Cash and cash equivalents at end of period $ 65,158 $ 63,632