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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Condensed Consolidated Statements of Comprehensive Income [Abstract] |  |  |  |
Tax expense recognized on the amortization of prior service cost | $ (6) | $ 1 | $ (13) | $ 3
Tax expense recognized on the net gain | $ (9) | $ 2 | $ (19) | $ 4

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