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Segment Information (Schedule Of Revenue And Long-Lived Assets, By Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Revenues	$ 507,937	$ 509,587	$ 515,897	$ 469,429	$ 463,214	$ 463,262	$ 463,469	$ 425,075	$ 2,002,850	$ 1,815,020	$ 1,666,470
Long-lived Assets	942,136				841,055				942,136	841,055	871,902
United States [Member]
Segment Reporting Information [Line Items]
Revenues									1,772,628	1,614,183	1,509,560
Long-lived Assets	931,658				824,649				931,658	824,649	853,802
Mexico [Member]
Segment Reporting Information [Line Items]
Revenues									147,938	121,821	84,441
Long-lived Assets	9,993				16,119				9,993	16,119	17,871
Other [Member]
Segment Reporting Information [Line Items]
Revenues									82,284	79,016	72,469
Long-lived Assets	485				287				485	287	229
Total Foreign Countries [Member]
Segment Reporting Information [Line Items]
Revenues									230,222	200,837	156,910
Long-lived Assets	$ 10,478				$ 16,406				$ 10,478	$ 16,406	$ 18,100

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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