Income Taxes (Schedule of Components of Income From Continuing Operations Before Tax) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income from continuing operations before income taxes	$ 240,214	$ 192,719	$ 159,280
Domestic [Member]
Income from continuing operations before income taxes	233,400	184,500	160,400
Foreign [Member]
Income from continuing operations before income taxes	$ 6,800	$ 8,200	$ (1,100)