Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Valuation allowances	$ 206,586	$ 4,200
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	113,000
Deferred Tax Assets, Operating Loss Carryforwards	222,065	14,140
Current Assets:
Cash and cash equivalents	430,316	450,193
Accounts receivable, net of allowances for doubtful accounts	476,903	489,749
Inventory	215,282	280,130
Prepaid Expense, Current	64,901	42,523
Total Current Assets	1,187,402	1,262,595
Property and Equipment, at cost	2,815,579	2,728,125
Less accumulated depreciation	1,751,375	1,574,867
Net Property and Equipment	1,064,204	1,153,258
Other Assets:
Goodwill	455,599	443,551
Other non-current assets	316,745	270,911
Total Other Assets	772,344	714,462
Total Assets	3,023,950	3,130,315
Current Liabilities:
Accounts payable	85,539	77,593
Accrued liabilities	350,258	430,771
Total Current Liabilities	435,797	508,364
Long-term Debt	792,312	793,058
Other Long-term Liabilities	131,323	312,250
Commitments and Contingencies
Stockholders' Equity:
Common Stock, par value $0.25	27,709	27,709
Additional paid-in capital	225,125	227,566
Treasury stock	(718,946)	(731,202)
Retained earnings	2,417,412	2,295,234
Accumulated other comprehensive income	(292,136)	(302,664)
Total Shareholders' Equity	1,659,164	1,516,643
Stockholders' Equity Attributable to Noncontrolling Interest	5,354	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,664,518	1,516,643
Total Liabilities and Sharesholders' Equity	$ 3,023,950	$ 3,130,315