CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 490,267	$ 454,092
Short-term investments, at cost which approximates market	15,769	14,178
Accounts receivable, less allowance for doubtful accounts:2013 - $1,715; 2012 - $3,837	204,449	193,328
Inventories	89,169	84,569
Prepaid expenses and other current assets	15,463	18,318
Total current assets	815,117	764,485
Property, plant and equipment, less accumulated depreciation and depletion	306,071	317,669
Goodwill	64,432	65,829
Other assets and deferred charges	31,927	63,206
Total assets	1,217,547	1,211,189
Current liabilities:
Short-term debt	5,504	7,111
Current maturities of long-term debt	8,200	76,977
Accounts payable	94,855	98,371
Income taxes payable	7,103	8,862
Accrued compensation and related items	37,868	33,603
Other current liabilities	27,364	25,174
Total current liabilities	180,894	250,098
Long-term debt	75,000	8,478
Accrued pension and postretirement benefits	57,893	108,035
Other non-current liabilities	29,352	30,859
Total liabilities	343,139	397,470
Commitments and contingent liabilities (Notes 15 and 16)
Shareholders' equity:
Preferred stock, without par value; 1,000,000 shares authorized; none issued	0	0
Common stock at par, $0.10 par value; 100,000,000 shares authorized; Issued 47,555,927 shares in 2013 and 47,002,939 shares in 2012	4,756	4,700
Additional paid-in capital	361,460	345,929
Retained earnings	1,106,252	1,032,869
Accumulated other comprehensive loss	(31,265)	(51,198)
Less common stock held in treasury, at cost; 13,205,741 shares in 2013 and 12,053,319 shares in 2012	(593,665)	(541,889)
Total MTI shareholders' equity	847,538	790,411
Non-controlling interest	26,870	23,308
Total shareholders' equity	874,408	813,719
Total liabilities and shareholders' equity	$ 1,217,547	$ 1,211,189