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Consolidated Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Operating Activities:    
Net income $ 30,339 $ 39,314
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 17,547 15,323
Deferred income tax benefit (3,707) (4,765)
Stock compensation 4,505 2,983
Defined benefit plan expense 117 105
Provision of doubtful accounts 274 252
Gain on revaluation of financial derivatives   (150)
Loss (gain) on sale of property and equipment 254 (41)
Changes in operating assets and liabilities:    
Accounts receivable (12,668) (16,711)
Inventory 6,624 (4,433)
Prepaid expenses and other assets (6,890) (6,674)
Accounts payable 1,749 13,148
Accrued liabilities 13,029 1,421
Net cash provided by operating activities 51,173 39,772
Investing Activities:    
Proceeds from the sale of property and equipment 27 225
Acquisition of subsidiary, net of cash acquired (73,666) (47)
Purchases of property and equipment (30,828) (23,029)
Net cash used in investing activities (104,467) (22,851)
Financing Activities:    
Borrowing of debt 75,000  
Repayments of debt (31,918) (2,801)
Excess tax (expense) benefit from equity awards (385) 1,462
Cash paid for financing costs (650)  
Cash paid for the cancellation of restricted stock (793) (467)
Proceeds from the exercise of Common Stock options 566 4,122
Net cash provided by financing activities 41,820 2,316
Foreign currency effect (998) (3,294)
Net increase (decrease) in cash and cash equivalents (12,472) 15,943
Cash and cash equivalents at beginning of period 144,479 85,700
Cash and cash equivalents at end of period 132,007 101,643
Supplemental disclosure of cash flow information:    
Cash paid for taxes 13,400 19,384
Cash paid for interest 1,526 890
Supplemental disclosure of non-cash transactions:    
Common Stock issued to Board of Directors and employees $ 2,432 $ 1,389