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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 5,269 $ 14,803
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 15,284 12,759
Gain on bargain purchase 0 (12,243)
Loss on sales and/or abandonment of property and equipment 351 212
Write-off of patents and intangible assets 57 18
Amortization of deferred credits (36) (40)
Amortization of long-term debt issuance costs 201 171
Deferred income taxes 0 (387)
Stock-based compensation expense 1,256 577
Changes in operating assets and liabilities, net of effects from acquisitions:    
Trade receivables (13,166) (5,757)
Other receivables 898 410
Inventories (5,388) 844
Prepaid expenses and other current assets (1,223) 229
Prepaid income taxes (72) (89)
Income tax refund receivables (205) (350)
Other assets (491) (1,172)
Trade payables 8,409 1,039
Accrued expenses (2,395) 3,199
Income taxes payable (480) (22)
Deferred compensation payable 3 187
Other long-term obligations (337) 790
Total adjustments 2,666 375
Net cash provided by operating activities 7,935 15,178
Capital expenditures for:    
Property and equipment (16,239) (10,178)
Intangible assets (885) (668)
Proceeds from the sale of property and equipment 3 3
Cash paid in acquisitions, net of cash acquired (100,195) (47,461)
Net cash used in investing activities (117,316) (58,304)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock 1,511 138,569
Offering costs 0 (833)
Proceeds from issuance of long-term debt 256,971 83,723
Payments on long-term debt (148,971) (170,723)
Contingent payments related to acquisitions (15) (15)
Net cash provided by financing activities 109,496 50,721
EFFECT OF EXCHANGE RATES ON CASH 1,720 (302)
NET INCREASE IN CASH AND CASH EQUIVALENTS 1,835 7,293
CASH AND CASH EQUIVALENTS:    
Beginning of period 32,336 19,171
End of period 34,171 26,464
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION    
Interest (net of capitalized interest of $146 and $119, respectively) 2,383 2,743
Income taxes 1,810 1,571
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Property and equipment purchases in accounts payable $ 1,752 $ 756