Fair Value Of Assets And Liabilities (Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Details) (USD $) In Thousands	Sep. 30, 2011		Dec. 31, 2010
Contingent consideration	$ 21,595
Total liabilities measured at fair value	21,595
Short-Term [Member]
Contingent consideration	10,483	[1]
Short-Term [Member] | Level 1 [Member]
Contingent consideration	0	[1]
Short-Term [Member] | Level 3 [Member]
Contingent consideration	10,483	[1]
Long-Term [Member]
Contingent consideration	11,112	[2]
Long-Term [Member] | Level 1 [Member]
Contingent consideration	0	[2]
Long-Term [Member] | Level 3 [Member]
Contingent consideration	11,112	[2]
Money Market Funds [Member]
Financial assets at fair value	0		101,600	[3]
Money Market Funds [Member] | Level 1 [Member]
Financial assets at fair value			101,600	[3]
Money Market Funds [Member] | Level 3 [Member]
Financial assets at fair value			0	[3]
Level 1 [Member]
Total liabilities measured at fair value	0
Level 3 [Member]
Total liabilities measured at fair value	$ 21,595

[1] Included in current installments of long-term obligations in the accompanying condensed consolidated balance sheets.

[2] Included in long-term obligations, excluding current installments in the accompanying condensed consolidated balance sheets.

[3] Included in cash and cash equivalents in the accompanying condensed consolidated balance sheets. The balance in money market funds at September 30, 2011 was $0.