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Retirement Plans (Details 8) (USD $) In Thousands, unless otherwise specified									12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 International hedge fund [Member]	Dec. 31, 2011 International hedge fund [Member]	Dec. 31, 2012 Long-biased hedge fund [Member]	Dec. 31, 2011 Long-biased hedge fund [Member]	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2011 Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member] International hedge fund [Member]	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member] Long-biased hedge fund [Member]
Reconciliation of Level 3 Long biased hedge fund assets within fair value hierarchy
Assets at fair value, Beginning balance	$ 278,991	$ 260,106	$ 10,395		$ 9,937	$ 0	$ 28,343	$ 5,124
Capital contributions									10,000	10,000
Realized and unrealized gain									395	(63)
Assets at fair value, Ending balance	$ 278,991	$ 260,106	$ 10,395		$ 9,937	$ 0	$ 28,343	$ 5,124	$ 10,395	$ 9,937

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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