Long-Term Debt (Narrative) (Details) (USD $)	3 Months Ended	6 Months Ended	9 Months Ended						3 Months Ended	2 Months Ended		3 Months Ended	2 Months Ended	3 Months Ended		3 Months Ended		9 Months Ended		9 Months Ended				6 Months Ended	9 Months Ended	6 Months Ended			9 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2013	Sep. 30, 2013 Combined Credit Agreements [Member]	Mar. 31, 2013 Combined Credit Agreements [Member]	Sep. 30, 2013 Canadian Credit Facility [Member]	Jun. 30, 2013 Senior Notes Due 2019 [Member]	Aug. 21, 2013 Senior Notes Due 2016 [Member]	Jun. 30, 2013 Senior Notes Due 2016 [Member]	Jun. 30, 2013 Senior Notes Due 2021 [Member] Rate	Aug. 21, 2013 Senior Notes Due 2015 [Member]	Sep. 30, 2013 Senior Notes Due 2015 [Member]	Jun. 30, 2013 Senior Notes Due 2015 [Member]	Jun. 30, 2013 Senior Secured Second Lien Term Loan Due 2019 [Member] Rate	Jun. 30, 2013 Senior Secured Second Lien Credit Facility [Member] Rate	Sep. 30, 2013 Combined Credit Agreements [Member]	Sep. 30, 2013 Global Letter Of Credit [Member]	Sep. 30, 2013 Maximum [Member] U.S. Credit Facility [Member]	Sep. 30, 2013 Maximum [Member] Combined Credit Agreements [Member]	Sep. 30, 2013 Minimum [Member]	Sep. 30, 2013 Multiple Subsidiaries Set Two [Member] U.S. Credit Facility [Member]	Jun. 30, 2013 Alternative Base Rate [Member] Senior Secured Second Lien Credit Facility [Member]	Sep. 30, 2013 London Interbank Offered Rate (LIBOR) [Member] U.S. Credit Facility [Member]	Jun. 30, 2013 London Interbank Offered Rate (LIBOR) [Member] Senior Secured Second Lien Credit Facility [Member]	Jun. 30, 2013 Libor [Member] Senior Secured Second Lien Term Loan Due 2019 [Member]	Jun. 30, 2013 Libor [Member] Senior Secured Second Lien Credit Facility [Member]	Sep. 30, 2013 Libor [Member] Maximum [Member] Canadian Credit Facility [Member]	Sep. 30, 2013 Libor [Member] Minimum [Member] Canadian Credit Facility [Member]
Debt Instrument [Line Items]
Percentage of ownership interest								100.00%															65.00%
Borrowing capacity						$ 350,000,000	$ 850,000,000												$ 280,000,000
Permitted second lien debt																		825,000,000
Debt Instrument, Covenant, Maximum Global Borrowing Base																		75.00%
Available borrowing under combined credit agreements																		157,800,000
Commitment fee percentage																		0.50%		1.75%	0.50%
Senior secured debt leverage ratio																		2.0
Increase Decrease In Applicable Margin On Loans																		0.75%
EBITDA to interest expense																						2.25
Minimum mortgage properties requirement					80.00%													87.50%
Premium and Tender Premium Paid	51,400,000
Payments of Financing Costs		23,400,000
Debt Issuance Cost	4,100,000
Debt Instrument, Face Amount											590,600,000	325,000,000			438,000,000	200,000,000	625,000,000
Repayments of Long-term Debt			1,308,382,000	111,115,000						654,400,000			450,700,000	2,300,000
Debt Issue Percentage												94.928%				97.00%	97.00%
Issuance of debt			1,173,306,000	367,646,000								308,500,000				194,000,000	606,300,000
Debt Instrument, Basis Spread on Variable Rate																				2.75%				4.75%	1.00%	5.75%	5.75%		3.75%	2.75%
Floor on Debt Rate																								2.25%			1.25%	1.25%
Debt Instrument, Interest Rate, Stated Percentage												11.00%
Long Term Debt Repurchase Price											1,068				1,027.90
Interest Paid on Repurchased Debt											55.49				32.08
Debt Instrument, Repurchase Amount											1,000				1,000
Amount Tendered											582,500,000				425,200,000
Consent Fee									$ 11,500,000