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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net income $ 45,483 $ 74,331
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 38,905 35,524
Loss on disposal of assets 1,560 1,236
Deferred income taxes 8,816 40,478
Stock based compensation 7,506 5,686
Accretion of deferred financing fees 1,696 444
Changes in assets and liabilities:    
Accounts and other receivables 46,878 (20,825)
Inventories 14,182 28,504
Accounts payable (10,675) (33,893)
Income taxes payable 0 (68)
Accrued liabilities (9,703) 2,234
Deferred income and customer advances (14,899) (24,766)
Other assets and liabilities (2,014) (10,414)
Net cash provided by operating activities 127,735 98,471
Cash flows from investing activities:    
Expenditures for property, plant and equipment (72,650) (67,206)
Other investing activities (1,656) (5,387)
Net cash used for investing activities (74,306) (72,593)
Cash flows from financing activities:    
Payment of long-term debt (266,625) 0
Borrowings from line of credit 284,500 308,500
Payments of line of credit (84,500) (308,500)
Payment of line of credit fees (1,362) 0
Principal payments under capital lease (225) (91)
Purchase of treasury shares (20,443) 0
Net cash used for financing activities (88,655) (91)
Net change in cash and cash equivalents (35,226) 25,787
Cash and cash equivalents at beginning of period 55,432 14,199
Cash and cash equivalents at the end of period 20,206 39,986
Supplemental non-cash investing activities:    
Capital expenditures included in accounts payable 17,649 17,228
Supplemental cash investing activities:    
Cash paid for interest 4,406 7,976
Cash paid for income taxes $ 7,254 $ 12,695