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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
OPERATING ACTIVITIES      
Net income (loss) $ 175,402 $ 162,511 $ (141,246)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation, amortization and other non-cash charges 166,789 166,558 221,038
Stock-based compensation expense 9,419 11,090 10,218
Gain on disposition of assets, net (3,344) (4,530) (7,920)
Gain due to insurance recovery (9,646)    
Gain due to benefit plan financing arrangement (1,020)    
Deferred income tax provision (benefit) 21,395 (42,609) (34,209)
Excess tax benefits for share-based payments     (427)
(Increase) decrease in assets:      
Accounts receivable 53,982 (208,642) 64,715
Income taxes receivable 4,410 16,931 (5,355)
Inventories (15,660) (6,275) 20,294
Prepaid expenses (778) (2,272) 2,244
Other current assets 3,375 (1,222) 2
Other non-current assets 1,494 (4,779) (1,851)
Increase (decrease) in liabilities:      
Accounts payable (7,754) 29,176 (6,250)
Income taxes payable 1,482 (1,705) (2,710)
Accrued payroll and related expenses 2,193 11,408 (4,540)
Accrued insurance expenses 884 1,200 (197)
Accrued state, local and other taxes (5,574) 5,561 256
Other accrued expenses (994) (5,335) 5,017
Pension liabilities (7,862) 4,398 (1,385)
Long-term accrued insurance expenses 1,696 839 (1,811)
Other long-term liabilities (880) 1,401 (14,179)
Net cash provided by operating activities 389,009 133,704 101,704
INVESTING ACTIVITIES      
Capital expenditures (242,610) (117,509) (33,938)
Proceeds from sale of assets 13,237 13,123 12,599
Proceeds from insurance recovery 9,646    
Proceeds from benefit plan refinancing arrangement 2,218    
Re-investment in benefit plan financing arrangement (2,218)    
Net cash used for investing activities (219,727) (104,386) (21,339)
FINANCING ACTIVITIES      
Payment of dividends (101,069) (43,319) (10,861)
Debt issue costs for notes payable to banks     (35)
Excess tax benefits for share-based payments     427
Cash paid for common stock purchased and retired (43,001) (26,784) (3,257)
Net cash used for financing activities (144,070) (70,103) (13,726)
Net increase (decrease) in cash and cash equivalents 25,212 (40,785) 66,639
Cash and cash equivalents at beginning of year 91,050 131,835 65,196
Cash and cash equivalents at end of year $ 116,262 $ 91,050 $ 131,835