Fair Value Measurement (Schedule Of Acquisition-Related Contingent Consideration) (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Sep. 30, 2015
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low		$ 0
Business Combination, Contingent Consideration, Arrangements, Range of Outcomes, Value, High		826,000
Payment for Contingent Consideration		0	$ 50,000
Acquisition Related Contingent Consideration [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Business Combination, Contingent Consideration, Liability		207,904
Acquisition Related Contingent Consideration [Member] | Level 3 [Member]
Acquisition-Related Contingent Consideration [Roll Forward]
Balance at beginning of period		(177,228)
Change in fair value		(30,676)
Balance at end of period		$ (207,904)
Acquisition Related Contingent Consideration [Member] | Minimum [Member] | Level 3 [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Cost of Debt		5.50%
Fair Value Inputs, Weighted Average Cost of Capital		10.00%
Acquisition Related Contingent Consideration [Member] | Maximum [Member] | Level 3 [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Weighted Average Cost of Capital		21.00%
Subsequent Event [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Payment for Contingent Consideration	$ 60,000