Income Taxes (Schedule of Components of Income from Continuing Operations before Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2014	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Domestic						$ 171,400	$ 233,400	$ 184,500
Foreign						27,000	6,800	8,200
Income from continuing operations before income taxes	$ 79,764	$ 54,499	$ 19,753	$ 74,252	$ 154,016	$ 198,430	$ 240,214	$ 192,719