Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 482,339	$ 450,193
Accounts receivable, net of allowances for doubtful accounts	466,456	489,749
Inventory	266,636	280,130
Other current assets	46,274	42,523
Total Current Assets	1,261,705	1,262,595
Property and Equipment, at cost	2,744,441	2,728,125
Less accumulated depreciation	1,644,251	1,574,867
Net Property and Equipment	1,100,190	1,153,258
Other Assets:
Goodwill	450,801	443,551
Other non-current assets	279,105	270,911
Total Other Assets	729,906	714,462
Total Assets	3,091,801	3,130,315
Current Liabilities:
Accounts payable	81,676	77,593
Accrued liabilities	401,230	430,771
Total Current Liabilities	482,906	508,364
Long-term Debt	794,099	793,058
Other Long-term Liabilities	323,651	312,250
Commitments and Contingencies
Stockholders' Equity:
Common Stock	27,709	27,709
Additional paid-in capital	221,731	227,566
Treasury stock, at cost	(719,706)	(731,202)
Retained earnings	2,260,353	2,295,234
Accumulated other comprehensive income	(298,942)	(302,664)
Total Shareholders' Equity	1,491,145	1,516,643
Total Liabilities and Sharesholders' Equity	$ 3,091,801	$ 3,130,315