CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 395,152	$ 367,827
Short-term investments, at cost which approximates market	18,494	16,707
Accounts receivable, less allowance for doubtful accounts: 2011 - $3,008; 2010 - $2,440	194,317	181,128
Inventories	90,760	86,464
Prepaid expenses and other current assets	21,566	23,446
Total current assets	720,289	675,572
Property, plant and equipment, less accumulated depreciation and depletion	318,134	332,797
Goodwill	64,671	67,156
Other assets and deferred charges	61,861	40,580
Total assets	1,164,955	1,116,105
Current liabilities:
Short-term debt	5,846	4,611
Current maturities of long-term debt	8,552	0
Accounts payable	103,354	80,728
Income taxes payable	5,334	6,606
Accrued compensation and related items	33,026	31,670
Restructuring liabilities	1,411	3,484
Other current liabilities	23,379	28,138
Total current liabilities	180,902	155,237
Long-term debt	85,449	92,621
Accrued pension and postretirement benefits	97,318	48,563
Other non-current liabilities	33,266	36,989
Total liabilities	396,935	333,410
Shareholders' equity:
Preferred stock, without par value; 1,000,000 shares authorized; none issued	0	0
Common stock at par, $010 par value; 100,000,000 shares authorized;issued 29,134,244 shares in 2011 and 28,969,244 shares in 2010	2,913	2,897
Additional paid-in capital	335,134	323,235
Retained earnings	963,130	899,211
Accumulated other comprehensive income (loss)	(45,331)	(3,590)
Less common stock held in treasury, at cost; 11,479,279 shares in 2011 and 10,670,693 shares in 2010	(514,234)	(466,230)
Total MTI shareholders' equity	741,612	755,523
Non-controlling interest	26,408	27,172
Total shareholders' equity	768,020	782,695
Total liabilities and shareholders' equity	$ 1,164,955	$ 1,116,105