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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Operating Activities    
Net income $ 19,529 $ 21,185
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 5,599 5,719
Amortization of bond premiums 106 389
Provision for losses on accounts receivable, net of adjustments (102) (8)
Provision for excess and obsolete inventories, net 59 156
Share-based compensation 1,281 984
Excess tax benefits from stock options exercised and restricted stock awards vested (2,452) (680)
Gain on disposal of assets (25) (24)
Foreign currency transaction loss 53 0
Interest income on note receivable (16) (20)
Deferred income taxes (563) (1,961)
Changes in assets and liabilities:    
Accounts receivable (1,286) (13,824)
Income tax receivable 1,636 1,753
Inventories (9,623) (4,624)
Prepaid expenses and other (446) (525)
Accounts payable (1,030) 3,422
Deferred revenue 136 378
Accrued liabilities (867) 5,185
Net cash provided by operating activities 11,989 17,505
Investing Activities    
Capital expenditures (9,304) (5,903)
Proceeds from sale of property, plant and equipment 30 29
Investment in certificates of deposits 0 (9,220)
Maturities of certificates of deposits 4,658 3,904
Purchases of investments held to maturity 0 (5,955)
Maturities of investments 9,201 6,539
Proceeds from called investments 504 1,269
Principal payments from note receivable 28 35
Net cash provided by (used in) investing activities 5,117 (9,302)
Financing Activities    
Stock options exercised 2,534 632
Excess tax benefits from stock options exercised and restricted stock awards vested 2,452 680
Repurchase of stock (6,444) (5,116)
Net cash used in financing activities (1,458) (3,804)
Net increase in cash and cash equivalents 15,648 4,399
Cash and cash equivalents, beginning of period 21,952 12,085
Cash and cash equivalents, end of period $ 37,600 $ 16,484