Long-Term Debt (Details) (USD $)	12 Months Ended					0 Months Ended			3 Months Ended				1 Months Ended				3 Months Ended			12 Months Ended				3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Senior Secured Credit Facility [Member]	Dec. 31, 2010 Senior Secured Credit Facility [Member]	May 06, 2010 8.75% Senior Subordinated Notes due 2020 [Member]	Dec. 31, 2011 8.75% Senior Subordinated Notes due 2020 [Member]	Dec. 31, 2010 8.75% Senior Subordinated Notes due 2020 [Member]	Dec. 31, 2011 8.75% Senior Subordinated Notes due 2020 [Member] On or after May 15 2015 [Member]	Dec. 31, 2011 8.75% Senior Subordinated Notes due 2020 [Member] On or after May 15 2016 [Member]	Dec. 31, 2011 8.75% Senior Subordinated Notes due 2020 [Member] On or after May 15 2017 [Member]	Dec. 31, 2011 8.75% Senior Subordinated Notes due 2020 [Member] On or after May 15 2018 and thereafter [Member]	Aug. 31, 2009 8.625% Senior Notes due 2017 [Member]	Dec. 31, 2011 8.625% Senior Notes due 2017 [Member]	Dec. 31, 2010 8.625% Senior Notes due 2017 [Member]	May 06, 2010 8.625% Senior Notes due 2017 [Member]	Dec. 31, 2011 8.625% Senior Notes due 2017 [Member] On or after August 1 2013 [Member]	Dec. 31, 2011 8.625% Senior Notes due 2017 [Member] On or after August 1 2014 [Member]	Dec. 31, 2011 8.625% Senior Notes due 2017 [Member] On or after August 1 2015 and thereafter [Member]	Dec. 31, 2011 7.50% Senior Subordinated Notes due 2015 [Member]	Dec. 31, 2010 7.50% Senior Subordinated Notes due 2015 [Member]	Dec. 31, 2009 7.50% Senior Subordinated Notes due 2015 [Member]	Jun. 30, 2007 7.50% Senior Subordinated Notes due 2015 [Member]	Dec. 31, 2011 7.50% Senior Subordinated Notes due 2015 [Member] On or after June 15 2011 [Member]	Dec. 31, 2011 7.50% Senior Subordinated Notes due 2015 [Member] On or after June 15 2012 [Member]	Dec. 31, 2011 7.50% Senior Subordinated Notes due 2015 [Member] On or after June 15 2013 and thereafter [Member]	Dec. 31, 2011 Other secured and unsecured notes payable [Member]	Dec. 31, 2010 Other secured and unsecured notes payable [Member]	Dec. 31, 2011 Convertible Debt [Member]
Debt Instrument [Line Items]
Long-term debt	$ 1,224,000,000	$ 1,176,700,000		$ 56,000,000	$ 0		$ 350,000,000	$ 350,000,000						$ 445,100,000	$ 444,500,000					$ 372,200,000	$ 381,500,000						$ 700,000	$ 700,000
Less current maturities	(111,000)	(95,000)
Total long-term debt	1,223,874,000	1,176,622,000
Stated percentage						8.75%							8.625%										7.50%
Face amount													450,000,000							385,000,000			385,000,000
Repurchase amount																				10,000,000
Proceeds from issuance of long-term debt	0	350,000,000	443,687,000			341,500,000							434,000,000
Basis spread on variable rate																													0.50%
Percentage of par increasing yield rate																98.597%							98.525%
Yield rate																8.875%
Loss on early extinguishment of debt, senior debt																				(10,000,000)
Senior indebtedness and secured indebtedness							1,500,000,000							750,000,000						1,500,000,000
Consolidated earnings before interest, taxes, depreciation and amortization							2.5							3.5						2.5
Maximum consolidated total assets	250,000,000
Percent of consolidated total assets	5.00%
Consolidated coverage ratio	2
Notes redeemable at a percentage of par									104.375%	102.917%	101.458%	100.00%					104.313%	102.156%	100.00%					103.75%	101.875%	100.00%
Interest expense before capitalization of interest	106,008,000	107,134,000	83,997,000
Less capitalized interest	(10,303,000)	(4,041,000)	(13,748,000)
Interest expense, net of capitalized interest	95,705,000	103,093,000	70,327,000
Loss on early extinguishment of debt																				200,000	1,900,000	9,500,000
Book value of long term debt	1,231,700,000	1,185,700,000
Fair value of long term debt	$ 1,243,468,000	$ 1,239,200,000