Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 367,150	$ 430,316
Accounts receivable, net of allowances for doubtful accounts	579,205	476,903
Inventory	189,119	215,282
Other current assets	54,362	64,901
Total Current Assets	1,189,836	1,187,402
Property and Equipment, at cost	2,831,728	2,815,579
Less accumulated depreciation	1,838,214	1,751,375
Net Property and Equipment	993,514	1,064,204
Other Assets:
Goodwill	500,164	455,599
Other non-current assets	240,185	316,745
Total Other Assets	740,349	772,344
Total Assets	2,923,699	3,023,950
Current Liabilities:
Accounts payable	111,756	85,539
Accrued liabilities	364,558	350,258
Total Current Liabilities	476,314	435,797
Long-term Debt	782,190	792,312
Other Long-term Liabilities	163,722	131,323
Commitments and Contingencies
Stockholders' Equity:
Common Stock	27,709	27,709
Additional paid-in capital	217,613	225,125
Treasury stock, at cost	(704,436)	(718,946)
Retained earnings	2,268,687	2,417,412
Accumulated other comprehensive income	(313,454)	(292,136)
Total Shareholders' Equity	1,496,119	1,659,164
Stockholders' Equity Attributable to Noncontrolling Interest	5,354	5,354
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,501,473	1,664,518
Total Liabilities and Sharesholders' Equity	$ 2,923,699	$ 3,023,950