Goodwill And Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 840,946		$ 840,946		$ 807,661
Amortization expense	24,800	$ 17,600	45,800	$ 34,600
Estimated future amortization expense in year 2016	109,200		109,200
Estimated future amortization expense in year 2017	66,400		66,400
Estimated future amortization expense in year 2018	43,400		43,400
Estimated future amortization expense in year 2019	29,100		29,100
Estimated future amortization expense in year 2020	22,300		22,300
Estimated future amortization expense thereafter	$ 86,900		$ 86,900
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