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Fair Value Measurements (Narrative) (Details) (USD $)	3 Months Ended
Fair Value Measurements (Narrative) (Details) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Long-term Debt gross	$ 447,558,000	$ 458,763,000
Contingent Consideration Discount Rate Used	1.60%
Estimated Probability Of Fair Value Variables Range Start	25.00%
Estimated Probability Of Fair Value Variables Range End	40.00%
Fair Value [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fixed Interest Rate [Member]
Long-term Debt gross	106,048,000	105,302,000
Fair Value [Member] \| Fair Value, Inputs, Level 2 [Member] \| Variable Interest Rate [Member]
Long-term Debt gross	348,689,000	357,575,000
Carrying Value [Member] \| Fixed Interest Rate [Member]
Long-term Debt gross	98,869,000	101,188,000
Carrying Value [Member] \| Variable Interest Rate [Member]
Long-term Debt gross	$ 348,689,000	$ 357,575,000

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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