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Consolidated Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating Activities:    
Net income $ 25,402 $ 11,893
Adjustments to reconcile net income to cash (used in) provided by operating activities:    
Depreciation and amortization 10,192 8,164
Deferred income taxes 676 (5,173)
Stock compensation 2,303 1,818
Defined benefit plan (income) expense (16) 45
Provision of doubtful accounts (54) 574
Gain on revaluation of financial derivatives   (456)
Loss on sale of property and equipment 103 29
Changes in operating assets and liabilities:    
Accounts receivable (13,900) (21,906)
Inventory (2,407) (1,223)
Prepaid expenses and other assets (6,492) (1,628)
Accounts payable 1,094 6,392
Accrued liabilities (38,237) 7,819
Net cash (used in) provided by operating activities (21,336) 6,348
Investing Activities:    
Proceeds from the sale of property and equipment 10 18
Final payment for acquisition of CSZ, net of cash acquired (2,000)  
Purchases of property and equipment (13,562) (17,010)
Net cash used in investing activities (15,552) (16,992)
Financing Activities:    
Borrowing of debt   75,000
Repayments of debt (8,427) (446)
Excess tax expense from equity awards   (385)
Cash paid for financing costs   (650)
Cash paid for the cancellation of restricted stock (926) (793)
Proceeds from the exercise of Common Stock options 881 204
Net cash (used in) provided by financing activities (8,472) 72,930
Foreign currency effect 2,080 3,791
Net (decrease) increase in cash and cash equivalents (43,280) 66,077
Cash and cash equivalents at beginning of period 177,187 144,479
Cash and cash equivalents at end of period 133,907 210,556
Supplemental disclosure of cash flow information:    
Cash paid for taxes 51,618 9,342
Cash paid for interest 858 458
Supplemental disclosure of non-cash transactions:    
Common Stock issued to Board of Directors and employees $ 1,125 $ 984