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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 $ 11,593 $ 27,293
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 12,542 11,296
Loss on disposal of assets 311 534
Deferred income taxes 1,741 11,706
Stock based compensation 2,281 1,684
Accretion of deferred financing fees 1,480 148
Changes in assets and liabilities:    
Accounts and other receivables 33,092 (36,295)
Inventories 4,573 16,941
Accounts payable (16,468) (176)
Income taxes payable 816 5,152
Accrued liabilities (9,631) (2,823)
Deferred income and customer advances (68) (5,860)
Other assets and liabilities 1,805 1,606
Net cash provided by operating activities 44,067 31,206
Cash flows from investing activities:    
Expenditures for property, plant and equipment (30,713) (33,214)
Other investing activities (1,002) (121)
Net cash used for investing activities (31,715) (33,335)
Cash flows from financing activities:    
Payment of long-term debt (266,625) 0
Borrowings from line of credit 246,000 167,500
Payments of line of credit (16,000) (167,500)
Payment of line of credit fees (1,362) 0
Principal payments under capital lease (75) (42)
Purchase of treasury shares (370) 0
Net cash used for financing activities (38,432) (42)
Net decrease in cash and cash equivalents (26,080) (2,171)
Cash and cash equivalents at beginning of period 55,432 14,199
Cash and cash equivalents at the end of period 29,352 12,028
Supplemental non-cash investing activities:    
Capital expenditures included in accounts payable 9,753 14,295
Supplemental cash investing activities:    
Cash paid for interest 1,777 2,434
Cash paid for income taxes $ 179 $ 0