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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net income $ 35,520 $ 40,003
Adjustments to reconcile net income to net cash (used for) provided by operating activities:    
Depreciation and amortization 27,872 25,913
Loss on disposal of assets 1,901 1,336
Deferred income taxes 10,109 6,845
Stock based compensation 5,574 4,880
Accretion of deferred financing fees 214 1,589
Restructuring charges 12,623 0
Changes in assets and liabilities:    
Accounts and other receivables 32,743 43,913
Inventories (2,494) 7,079
Accounts payable (30,586) (30,185)
Accrued liabilities (1,771) (6,805)
Deferred income and customer advances (19,372) (14,769)
Other assets and liabilities (4,970) (2,578)
Net cash provided by operating activities 67,363 77,221
Cash flows from investing activities:    
Expenditures for property, plant and equipment (71,201) (53,423)
Other investing activities (1,285) (1,254)
Net cash used for investing activities (72,486) (54,677)
Cash flows from financing activities:    
Payments of long-term debt 0 (266,625)
Borrowings from line of credit 210,250 261,000
Payments of line of credit (155,250) (51,000)
Payment of line of credit facility fees 0 (1,362)
Principal payments of finance leases (2,377) (162)
Purchase of treasury stock (40,267) (3,113)
Issuance of common stock 16 0
Net cash provided by (used for) financing activities 12,372 (61,262)
Net change in cash and cash equivalents 7,249 (38,718)
Cash and cash equivalents at beginning of period 9,808 55,432
Cash and cash equivalents at the end of period 17,057 16,714
Supplemental non-cash investing activities:    
Capital expenditures included in accounts payable 18,451 7,704
Supplemental cash activities:    
Cash paid for interest 2,295 3,204
Cash paid for income taxes $ 6,576 $ 2,240