Fair Value Of Financial Instruments (Narrative) (Details) (USD $)			9 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2014 Fair Value, Measurements, Non-Recurring [Member]	Dec. 31, 2013 Fair Value, Measurements, Non-Recurring [Member]	Sep. 30, 2014 Level 1 [Member] Fair Value, Measurements, Non-Recurring [Member] Unsecured Debt [Member] Senior Notes [Member]	Sep. 30, 2014 Earn-Out Arrangements [Member]	Sep. 30, 2013 Earn-Out Arrangements [Member]	Sep. 30, 2014 Earn-Out Arrangements [Member]	Sep. 30, 2013 Earn-Out Arrangements [Member]	Sep. 30, 2014 Earn-Out Arrangements [Member] Foreign Currency Translation Adjustments [Member]	Sep. 30, 2013 Earn-Out Arrangements [Member] Foreign Currency Translation Adjustments [Member]	Sep. 30, 2014 Earn-Out Arrangements [Member] Foreign Currency Translation Adjustments [Member]	Sep. 30, 2013 Earn-Out Arrangements [Member] Foreign Currency Translation Adjustments [Member]	Sep. 30, 2014 Earn-Out Arrangements [Member] Level 3 [Member] Fair Value, Measurements, Recurring [Member] Liability [Member]	Sep. 30, 2014 Earn-Out Arrangements [Member] Level 3 [Member] Fair Value [Member]	Dec. 31, 2013 Earn-Out Arrangements [Member] Level 3 [Member] Fair Value [Member]
Fair Value, Selected Financial Instruments Measured on A Recurring and Non-Recurring Basis [Line Items]
ASC 805 contingent consideration, fair value													$ 149,600,000	$ 165,400,000
Fair value measurements, valuation techniques			The estimated fair values of the Company’s 4.875% Senior Notes, 2009 Convertible Notes and 2011 Convertible Notes are based on quoted market prices, a Level 1 input.									The fair value of ASC 805 contingent consideration is based on management estimates and entity-specific assumptions and is evaluated on an on-going basis.
Additions from new business combinations, ASC 805 contingent consideration				0	3,300,000	35,000,000	30,000,000
Payments of ASC 805 contingent consideration				1,300,000	0	48,300,000	2,700,000
Foreign currency translation gains (losses), other comprehensive income, ASC 805 contingent consideration								2,900,000	(700,000)	2,500,000	1,100,000
Cost and equity method investments, including long-term receivables from investees and joint ventures, aggregate carrying value	$ 15,000,000	$ 15,800,000