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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash provided by (used for) operating activities:    
Net income $ 17,148 $ 19,838
Adjustments to reconcile net income to net cash provided by (used for) operating activities:    
Depreciation and amortization 18,994 14,459
Provision for doubtful accounts 123 189
Provision for inventory write-downs 2,398 2,258
Deferred income taxes 1,413 (515)
Tax benefit from exercise of stock options and vested restricted stock 2,230 1,023
Excess tax benefit from stock-based compensation (2,292) (1,071)
Shares issued for employee benefit plan 763 734
Employee and director stock-based compensation 7,638 5,923
Performance-based warrant stock-based compensation 3,219 0
Changes in operating assets and liabilities:    
Restricted cash 0 (4,623)
Accounts receivable (11,359) (17,851)
Inventories (4,470) (20,261)
Prepaid expenses and other assets (86) 426
Accounts payable and accrued expenses 7,699 21,821
Accrued income taxes (4,737) 180
Net cash provided by (used for) operating activities 38,681 22,530
Cash used for investing activities:    
Acquisition of property, plant, and equipment (28,914) (26,376)
Acquisition of intangible assets (1,373) (1,877)
Increase in restricted cash (4,797) 0
Deposit received toward sale of Guangzhou factory 4,797 0
Deconsolidation of Encore Controls LLC 48 0
Acquisition of net assets of Ecolink Intelligent Technology, Inc., net of cash acquired 0 (12,482)
Net cash used for investing activities (30,239) (40,735)
Cash provided by (used for) financing activities:    
Borrowings under line of credit 92,987 69,500
Repayments on line of credit (107,987) (22,500)
Proceeds from stock options exercised 4,813 1,648
Treasury stock purchased (2,188) (78,708)
Excess tax benefit from stock-based compensation 2,292 1,071
Net cash provided by (used for) financing activities (10,083) (28,989)
Effect of exchange rate changes on cash (3,184) (1,019)
Net increase (decrease) in cash and cash equivalents (4,825) (48,213)
Cash and cash equivalents at beginning of year 52,966 112,521
Cash and cash equivalents at end of period 48,141 64,308
Supplemental cash flow information:    
Income taxes paid 6,034 3,922
Interest paid $ 926 $ 68