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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Issuance of stock to employees under benefit plans, shares withheld for payroll tax | $ 11,582 | $ 12,297 | $ 7,269
Unrealized gain on marketable securities, tax portion | 169 | 666 | 0
Amortization of prior service costs, tax | $ (134) | $ 9 | $ 0

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