Consolidated Balance Sheets - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Contract with Customer, Asset, Net, Current	$ 164,847,000	$ 221,997,000
Valuation allowances	679,242,000	592,516,000
Deferred Tax Assets, Operating Loss Carryforwards	551,724,000	521,757,000
Current Assets:
Cash and cash equivalents	538,114,000	452,016,000
Accounts receivable, net of allowances for doubtful accounts	262,960,000	296,214,000
Inventory	153,682,000	141,241,000
Other Assets, Current	68,400,000	58,795,000
Prepaid Expense, Current	62,171,000	48,616,000
Total Current Assets	1,188,003,000	1,170,263,000
Other Assets:
Property and Equipment, at cost	2,452,421,000	2,456,602,000
Less accumulated depreciation	1,962,825,000	1,865,495,000
Net Property and Equipment	489,596,000	591,107,000
Goodwill	34,908,000	35,016,000
Other non-current assets	104,255,000	108,250,000
Operating Lease, Right-of-Use Asset	146,097,000	141,206,000
Assets, Noncurrent	285,260,000	284,472,000
Total Assets	1,962,859,000	2,045,842,000
Current Liabilities:
Accounts payable	122,327,000	94,207,000
Accrued liabilities	290,659,000	292,863,000
Contract with Customer, Liability, Current	88,175,000	50,046,000
Total Current Liabilities	501,161,000	437,116,000
Long-term Debt	702,067,000	805,251,000
Other Long-term Liabilities	90,104,000	89,244,000
Commitments and Contingencies
Common stock, shares issued	110,834,088
Common stock, shares authorized	360,000,000
Common stock, par value (in dollars per share)	$ 0.25
Stockholders' Equity:
Common Stock, par value $0.25	$ 27,709,000	27,709,000
Additional paid-in capital	$ 173,608,000	$ 192,492,000
Treasury stock, shares	11,033,098	11,525,725
Treasury Stock, Common, Value	$ (631,811,000)	$ (660,021,000)
Retained earnings	1,301,913,000	1,351,220,000
Accumulated other comprehensive income	(366,458,000)	(359,306,000)
Total Shareholders' Equity	504,961,000	552,094,000
Noncontrolling Interest in Variable Interest Entity	6,063,000	6,063,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	511,024,000	558,157,000
Total Liabilities and Sharesholders' Equity	1,962,859,000	2,045,842,000
Operating Lease, Liability, Noncurrent	158,503,000	156,074,000
Contract with Customer, Liability	88,175,000	50,046,000
Allowance for Doubtful Accounts Receivable, Current	$ 1,210,000	$ 4,466,000