Accumulated Other Comprehensive Income (Loss) (Summary Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income Loss [Line Items]
Balance			$ 975,689	$ 902,065
Change associated with foreign currency translation	$ (70)	$ (347)	240	(531)
Balance	953,151	1,039,705	953,151	1,039,705
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance			(1,136)
Change associated with foreign currency translation			240
Change associated with current period hedging
Reclassification into earnings
Balance	(896)		(896)
Cash Flow Hedge [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance			(1,520)
Change associated with foreign currency translation
Change associated with current period hedging			(361)
Reclassification into earnings			(1,942)
Balance	(3,823)		(3,823)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance			(2,656)	(1,955)
Change associated with foreign currency translation			240	(531)
Change associated with current period hedging			(361)
Reclassification into earnings			(1,942)
Balance	(4,719)	$ (2,931)	(4,719)	$ (2,931)
Change Healthcare Holdings, Inc. [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance			975,689
Balance	$ 953,151		$ 953,151