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Fair Value Measurements (Narrative) (Details) (USD $)	9 Months Ended
Fair Value Measurements (Narrative) (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Long-term Debt gross	$ 397,955,000	$ 458,763,000
Contingent Consideration Discount Rate Used	1.60%
Estimated Probability Of Fair Value Variables Range Start	10.00%
Estimated Probability Of Fair Value Variables Range End	60.00%
Fair Value [Member] \| Fixed Interest Rate [Member]
Long-term Debt gross	106,695,000	105,302,000
Fair Value [Member] \| Variable Interest Rate [Member]
Long-term Debt gross	300,996,000	357,575,000
Carrying Value [Member] \| Fixed Interest Rate [Member]
Long-term Debt gross	96,959,000	101,188,000
Carrying Value [Member] \| Variable Interest Rate [Member]
Long-term Debt gross	$ 300,996,000	$ 357,575,000

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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