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Consolidated Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Operating Activities:    
Net income $ 33,915 $ 30,339
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 21,191 17,547
Deferred income taxes (2,278) (3,707)
Stock compensation 4,761 4,505
Defined benefit plan expense 94 117
Provision of doubtful accounts 6 274
Loss on sale of property and equipment 249 254
Changes in operating assets and liabilities:    
Accounts receivable (6,949) (12,668)
Inventory 1,149 6,624
Prepaid expenses and other assets (5,147) (6,890)
Accounts payable (2,932) 1,749
Accrued liabilities (37,944) 13,029
Net cash provided by operating activities 6,115 51,173
Investing Activities:    
Proceeds from the sale of property and equipment 34 27
Acquisition of subsidiary, net of cash acquired (2,000) (73,666)
Purchases of property and equipment (25,750) (30,828)
Net cash used in investing activities (27,716) (104,467)
Financing Activities:    
Borrowing of debt   75,000
Repayments of debt (8,428) (31,918)
Excess tax expense from equity awards   (385)
Cash paid for financing costs   (650)
Cash paid for the cancellation of restricted stock (1,100) (793)
Cash paid for the repurchase of common stock (53)  
Proceeds from the exercise of Common Stock options 2,061 566
Net cash (used in) provided by financing activities (7,520) 41,820
Foreign currency effect 16,111 (998)
Net decrease in cash and cash equivalents (13,010) (12,472)
Cash and cash equivalents at beginning of period 177,187 144,479
Cash and cash equivalents at end of period 164,177 132,007
Supplemental disclosure of cash flow information:    
Cash paid for taxes 58,831 13,400
Cash paid for interest 2,190 1,526
Supplemental disclosure of non-cash transactions:    
Common Stock issued to Board of Directors and employees $ 2,229 $ 2,432