Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2013

Supplemental Cash Flow Elements [Abstract]

Changes in Operating Assets and Liabilities

a) The changes in operating assets and liabilities for the years ended December 31, 2013, 2012, and 2011, are as follows:

	Year Ended December 31,
	2013			2012			2011
Accounts receivable		(77,837	)		(132,873	)		(68,914	)
Prepaid expenses and other assets		(2,386	)		19,741			(8,225	)
Accounts payable		(10,877	)		18,408			12,216
Accrued and other liabilities		155,284			(20,485	)		(19,424	)
		64,184			(115,209	)		(84,347	)