Goodwill And Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 829,012		$ 807,661
Amortization expense	21,100	$ 16,900
Estimated future amortization expense in year 2016	98,400
Estimated future amortization expense in year 2017	67,100
Estimated future amortization expense in year 2018	44,600
Estimated future amortization expense in year 2019	28,400
Estimated future amortization expense in year 2020	21,400
Estimated future amortization expense thereafter	$ 91,200
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets minimum useful life (years)	1 year
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets minimum useful life (years)	20 years