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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash provided by (used for) operating activities:    
Net income $ 9,341 $ 13,564
Adjustments to reconcile net income to net cash provided by (used for) operating activities:    
Depreciation and amortization 12,032 9,412
Provision for doubtful accounts 116 138
Provision for inventory write-downs 1,705 1,617
Deferred income taxes 165 (655)
Tax benefit from exercise of stock options and vested restricted stock 992 689
Excess tax benefit from stock-based compensation (1,047) (713)
Shares issued for employee benefit plan 551 593
Employee and director stock-based compensation 4,970 3,983
Performance-based warrant stock-based compensation 2,058 0
Changes in operating assets and liabilities:    
Accounts receivable (9,599) (8,741)
Inventories 982 (14,994)
Prepaid expenses and other assets (243) (378)
Accounts payable and accrued expenses 4,488 1,395
Accrued income taxes (3,260) 32
Net cash provided by (used for) operating activities 23,251 5,942
Cash used for investing activities:    
Acquisition of property, plant, and equipment (17,989) (15,655)
Acquisition of intangible assets (993) (1,252)
Deconsolidation of Encore Controls LLC 48 0
Net cash used for investing activities (18,934) (16,907)
Cash provided by (used for) financing activities:    
Borrowings under line of credit 57,987 19,500
Repayments on line of credit (65,000) (7,500)
Proceeds from stock options exercised 2,536 1,648
Treasury stock purchased (1,944) (34,297)
Excess tax benefit from stock-based compensation 1,047 713
Net cash provided by (used for) financing activities (5,374) (19,936)
Effect of exchange rate changes on cash (2,464) 542
Net increase (decrease) in cash and cash equivalents (3,521) (30,359)
Cash and cash equivalents at beginning of year 52,966 112,521
Cash and cash equivalents at end of period 49,445 82,162
Supplemental cash flow information:    
Income taxes paid 4,647 2,979
Interest paid $ 609 $ 0