Supplemental Cash Flow Information (Details) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash paid for or (received from):
Interest expense	$ 208,849,000	$ 211,497,000
Interest and dividend income	(3,518,000)	(4,146,000)
Income taxes, net of refunds	11,944,000	8,250,000
Capital lease and other non-cash financing transactions	$ 45,600,000	$ 41,800,000