Supplemental Cash Flow Supplemental Cash Flow (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Cash Flow Information [Abstract]
Income Taxes Paid	$ 35,079,000	$ 121,245,000	$ 144,405,000
Interest Paid, Net	209,580,000	212,364,000	242,587,000
Capital Lease Obligations [Member]
Other Significant Noncash Transactions [Line Items]
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed	4,178	3,583	4,649
Notes Received from Property Sales [Member]
Other Significant Noncash Transactions [Line Items]
Other Significant Noncash Transaction, Value of Consideration Received	175,371	63,051	61,690
Commercial Paper [Member]
Other Significant Noncash Transactions [Line Items]
Other Significant Noncash Transaction, Value of Consideration Received	$ 6,236