CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 29, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 469,654	$ 454,092
Short-term investments, at cost which approximates market	16,295	14,178
Accounts receivable, net	207,221	193,328
Inventories	90,309	84,569
Prepaid expenses and other current assets	20,164	18,318
Total current assets	803,643	764,485
Property, plant and equipment, less accumulated depreciation and depletion - September 29, 2013 - $967,765; December 31,2012 - $944,283	307,882	317,669
Goodwill	64,683	65,829
Other assets and deferred charges	50,654	63,206
Total assets	1,226,862	1,211,189
Current liabilities:
Short-term debt	6,921	7,111
Current maturities of long-term debt	570	76,977
Accounts payable	105,318	98,371
Other current liabilities	63,835	67,639
Total current liabilities	176,644	250,098
Long-term debt	83,200	8,478
Accrued Pension and Post-Retirement Benefits	105,902	108,035
Other non-current liabilities	28,842	30,859
Total liabilities	394,588	397,470
Shareholders' equity:
Common stock	4,753	4,700
Additional paid-in capital	363,425	345,929
Retained earnings	1,085,379	1,032,869
Accumulated other comprehensive loss	(58,679)	(51,198)
Less common stock held in treasury	(585,899)	(541,889)
Total MTI shareholders' equity	808,979	790,411
Non-controlling interest	23,295	23,308
Total shareholders' equity	832,274	813,719
Total liabilities and shareholders' equity	$ 1,226,862	$ 1,211,189