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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of assets and liabilities measured at fair value on a recurring basis
Corporate and municipal bonds	$ 27,255	$ 29,776	$ 30,923
Level 1 [Member]
Summary of assets and liabilities measured at fair value on a recurring basis
Deferred compensation plan assets	43,965	39,779
Corporate and municipal bonds	27,255	29,776
Level 2 [Member]
Summary of assets and liabilities measured at fair value on a recurring basis
Interest rate swaps	(713)	(817)
Level 3 [Member]
Summary of assets and liabilities measured at fair value on a recurring basis
Contingent purchase price liabilities	$ (29,951)	$ (30,012)

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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