Goodwill and Other Intangible Assets (Other Intangible Assets) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Amortization of Intangible Assets
Amortization of intangible assets	$ 13,060	$ 10,384
Estimated amortization of intangible assets, remainder of 2019	38,000
Estimated amortization of intangible assets, 2020	48,000
Estimated amortization of intangible assets, 2021	43,000
Estimated amortization of intangible assets, 2022	37,000
Estimated amortization of intangible assets, 2023	30,000
Estimated amortization of intangible assets, after 2023	$ 54,000