CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Jul. 01, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 421,459	$ 395,152
Short-term investments, at cost which approximates market	19,268	18,494
Accounts receivable, net	196,509	194,317
Inventories	90,573	90,760
Prepaid expenses and other current assets	20,348	21,566
Total current assets	748,157	720,289
Property, plant and equipment, less accumulated depreciation and depletion - July 1, 2012 - $945,375; December 31, 2011 - $930,515	314,595	318,134
Goodwill	65,316	64,671
Other assets and deferred charges	57,313	61,861
Total assets	1,185,381	1,164,955
Current liabilities:
Short-term debt	4,417	5,846
Current maturities of long-term debt	9,976	8,552
Accounts payable	107,030	103,354
Restructuring liabilities	586	1,411
Other current liabilities	58,854	61,739
Total current liabilities	180,863	180,902
Long-term debt	83,751	85,449
Accrued Pension and Post-Retirement Benefits	93,328	97,318
Other non-current liabilities	29,868	33,266
Total liabilities	387,810	396,935
Shareholders' equity:
Common stock	2,923	2,913
Additional paid-in capital	338,670	335,134
Retained earnings	999,102	963,130
Accumulated other comprehensive loss	(47,691)	(45,331)
Less common stock held in treasury	(520,211)	(514,234)
Total MTI shareholders' equity	772,793	741,612
Non-controlling interest	24,778	26,408
Total shareholders' equity	797,571	768,020
Total liabilities and shareholders' equity	$ 1,185,381	$ 1,164,955