Segments and Related Information (Reconciliation of EBITDA to Consolidated Income from Continuing Operations before Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
EBITDA Reconciliation:
EBITDA - Continuing operations	$ 67,800	$ 134,200	$ 164,400	$ 303,600
Interest expense, net	(11,964)	(12,643)	(35,845)	(37,595)
Depreciation and amortization	(42,196)	(41,747)	(128,048)	(111,996)
Income from continuing operations before income taxes	$ 13,639	$ 79,764	$ 522	$ 154,016