Segments and Related Information (Reconciliation of EBITDA to Consolidated 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
EBITDA Reconciliation:
EBITDA - Continuing operations	$ 134,200	$ 104,200	$ 65,300	$ 169,500	$ 303,600	$ 403,700	$ 427,600	$ 322,100
Interest expense, net	(12,643)	(12,949)	(12,003)	(24,952)	(37,595)	(50,769)	(46,442)	(37,376)
Depreciation and amortization	(41,747)	(36,755)	(33,494)	(70,249)	(111,996)	(154,452)	(140,926)	(91,958)
Income from continuing operations before income taxes	$ 79,764	$ 54,499	$ 19,753	$ 74,252	$ 154,016	$ 198,430	$ 240,214	$ 192,719