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Business Segment Information (Schedule of Revenues And Assets Based On Location) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 423,225	$ 416,254	$ 409,586	$ 400,820	$ 405,057	$ 408,682	$ 404,830	$ 405,598	$ 1,649,885	$ 1,624,167	$ 1,526,552
Assets	2,151,370				1,971,668				2,151,370	1,971,668
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									1,385,744	1,348,130	1,298,381
Assets	1,732,427				1,612,202				1,732,427	1,612,202
International operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									264,141	276,037	$ 228,171
Assets	$ 418,943				$ 359,466				$ 418,943	$ 359,466

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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