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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities    
Net income $ 21,272 $ 20,173
Adjustments to reconcile net income to net cash provided by operating activities    
Depreciation 5,163 4,202
Amortization of intangibles 4,941 4,501
Net gain on sale of property, plant and equipment (6,013) (2,456)
Loss on debt extinguishment 174 640
Deferred income taxes (23) (13)
Stock-based compensation 2,657 2,963
Non-cash interest expense 675 520
Changes in operating assets and liabilities    
Accounts receivable (45,910) 36,353
Inventories (58,393) (51,692)
Prepaid expenses and other 591 8,286
Accounts payable and accrued liabilities 63,943 41,395
Other, net (1,120) 428
Net cash (used in) provided by operating activities (12,043) 65,300
Cash flows from investing activities    
Capital expenditures (6,060) (3,173)
Proceeds from the sale of property, plant, and equipment 9,523 3,761
Other, net 3,060 1,218
Net cash provided by investing activities 6,523 1,806
Cash flows from financing activities    
Proceeds from exercise of stock options 861 5,408
Dividends paid (4,692) (3,893)
Borrowings under revolving credit facilities 254 152
Payments under revolving credit facilities (254) (152)
Principal payments under capital lease obligations (71) (171)
Proceeds from issuance of term loan credit facility 0 189,470
Principal payments under term loan credit facility (471) (189,944)
Principal payments under industrial revenue bond (92) (177)
Debt issuance costs paid 0 (354)
Convertible senior notes repurchase (17,183) 0
Stock repurchase (5,412) (16,625)
Net cash used in financing activities (27,060) (16,286)
Net (decrease) increase in cash, cash equivalents, and restricted cash (32,580) 50,820
Cash, cash equivalents and restricted cash at beginning of period 191,521 163,467
Cash, cash equivalents, and restricted cash at end of period $ 158,941 $ 214,287