Debt (Narrative) (Details) (USD $)	12 Months Ended							12 Months Ended				12 Months Ended					12 Months Ended				1 Months Ended	3 Months Ended	12 Months Ended		12 Months Ended		12 Months Ended						12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Mar. 31, 2012	Dec. 31, 2009	Nov. 21, 2012 Term Loan Due 2018 [Member]	May 16, 2012 Term Loan Due 2018 [Member]	Dec. 31, 2012 6.75% Senior Notes Due 2013 [Member]	May 30, 2012 6.75% Senior Notes Due 2013 [Member]	May 16, 2012 6.75% Senior Notes Due 2013 [Member]	Dec. 31, 2012 6.75% Senior Notes Due 2013 [Member] Maximum [Member]	Dec. 31, 2012 9.875% Senior Notes Due 2019 [Member]	Dec. 31, 2012 9.125% Senior Notes Due 2018 [Member]	Dec. 31, 2012 9.00% Convertible Senior Notes Due 2012 [Member]	Dec. 31, 2011 ICG Debt [Member]	Dec. 31, 2012 ICG Debt [Member]	Dec. 31, 2012 6.75% Senior Notes Due 2013 [Member]	Dec. 31, 2010 6.75% Senior Notes Due 2013 [Member]	Dec. 31, 2012 4.00% Convertible Senior Notes Due 2017 [Member]	Dec. 31, 2012 4.00% and 9.00% Convertible Senior Notes [Member]	Dec. 31, 2012 Loans Payable [Member]	Nov. 20, 2012 Loans Payable [Member]	Dec. 31, 2012 Loans Payable [Member]	Dec. 31, 2012 Loans Payable [Member] Minimum [Member]	Dec. 31, 2012 Line of Credit [Member]	Nov. 21, 2012 Line of Credit [Member]	Dec. 31, 2012 Line of Credit [Member] Maximum [Member]	Dec. 31, 2012 Line of Credit [Member] Minimum [Member]	Dec. 31, 2012 8.75% Senior Notes Due 2016 [Member]	Dec. 31, 2012 7.25% Senior Notes Due 2020 [Member]	Dec. 31, 2012 7.00% Senior Notes Due 2019 [Member]	Dec. 31, 2012 7.25% Senior Notes Due 2021 [Member]	Dec. 31, 2012 2019 and 2021 notes [Member]	Dec. 31, 2012 Redeemable Between August 1, 2013 And July 31, 2014 [Member] 8.75% Senior Notes Due 2016 [Member]	Dec. 31, 2012 Redeemable Between August 1, 2014 And July 31, 2015 [Member] 8.75% Senior Notes Due 2016 [Member]	Dec. 31, 2012 August 1, 2015 and Beyond [Member] 8.75% Senior Notes Due 2016 [Member]	Dec. 31, 2012 Redeemable between October 1, 2015 and September 30, 2016 [Member] 7.25% Senior Notes Due 2020 [Member]	Dec. 31, 2012 Redeemable between October 1, 2016 and September 30, 2017 [Member] 7.25% Senior Notes Due 2020 [Member]	Dec. 31, 2012 Redeemable between October 1, 2017 and September 30, 2018 [Member] 7.25% Senior Notes Due 2020 [Member]	Dec. 31, 2012 Redeemable on or after October 1, 2018 [Member] 7.25% Senior Notes Due 2020 [Member]	Dec. 31, 2012 Prior to October 1, 2013 [Member] 7.25% Senior Notes Due 2020 [Member]	Dec. 31, 2012 Prior to June 15, 2015 [Member] 7.00% Senior Notes Due 2019 [Member]	Dec. 31, 2012 Prior to June 15, 2016 [Member] 7.25% Senior Notes Due 2021 [Member]	Dec. 31, 2012 Redeemable between June 15, 2015 and June 14, 2016 [Member] 7.00% Senior Notes Due 2019 [Member]	Dec. 31, 2012 Redeemable between June 15, 2016 and June 14, 2017 [Member] 7.00% Senior Notes Due 2019 [Member]	Dec. 31, 2012 Redeemable between June 15, 2016 and June 14, 2017 [Member] 7.25% Senior Notes Due 2021 [Member]	Dec. 31, 2012 June 15, 2017 and Beyond [Member] 7.00% Senior Notes Due 2019 [Member]	Dec. 31, 2012 Redeemable between June 15, 2017 and June 14, 2018 [Member] 7.25% Senior Notes Due 2021 [Member]	Dec. 31, 2012 Redeemable between June 15, 2018 and June 14, 2019 [Member] 7.25% Senior Notes Due 2021 [Member]	Dec. 31, 2012 June 15, 2019 and Beyond [Member] 7.25% Senior Notes Due 2021 [Member]	Dec. 31, 2012 Redeemable between December 15, 2016 and December 14, 2017 [Member] 9.875% Senior Notes Due 2019 [Member]	Dec. 31, 2012 Redeemable between December 15, 2017 and December 14, 2018 [Member] 9.875% Senior Notes Due 2019 [Member]	Dec. 31, 2012 December 15, 2018 and beyond [Member] 9.875% Senior Notes Due 2019 [Member]	Dec. 31, 2012 Prior to December 15, 2015 [Member] 9.875% Senior Notes Due 2019 [Member]	Dec. 31, 2012 Repayment of Debt [Member] 9.125% Senior Notes Due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount												$ 375,000,000									$ 1,642,375,000		$ 1,642,375,000						$ 600,000,000	$ 500,000,000	$ 1,000,000,000	$ 1,000,000,000
Debt Instrument Initial Issue Price Percentage Of Face Amount												95.934%																	97.464%
Call Premium																																		104.375%	102.188%	100.00%	0.00%	102.417%	101.208%	100.00%	107.25%	107.00%	107.25%	103.50%	101.75%	103.625%	100.00%	102.417%	101.208%	100.00%	104.938%	102.469%	100.00%	109.875%
Subsequent Event, senior notes redeemed																																																							251,400,000
Interest Paid	310,241,000	213,697,000	134,866,000										5,200,000
Percentage Of Maximum Redemption Aggregate Principal Amount From Equity Proceeds												35.00%																		35.00%			35.00%
Line of credit facility, maximum borrowing capacity	600,000,000			2,000,000,000																					350,000,000	600,000,000
Long-term Debt						250,000,000	1,400,000,000
Proceeds from Issuance of Long-term Debt	1,633,500,000
Debt instrument, maturity period																							6 years
Debt instrument, discount (premium), percentage																							1.00%
Debt instrument, periodic principal payment																					4,125,000	3,500,000
Debt Instrument, Date of First Required Payment																									Sep. 30, 2012
Maximum dividend allowed by credit facility	$ 0.03
Frequency of periodic payment												Interest is payable on the 9.875%9.875% Notes annually on June 15 and December 15, beginning on June 15, 2013											Quarterly						Interest is payable on the notes on February 1 and August 1 of each year.	Interest is payable on the 2020 Notes on April 1 and October 1 of each year			Interest is payable on the 2019 Notes and 2021 Notes on June 15 and December 15 of each year
DebtInstrumentRedemptionPeriod																																		between August 1, 2013 and July 31, 2014	between August 1, 2014 and July 31, 2015	on or after August 1, 2015	between October 1, 2015 and September 30, 2016	between October 1, 2016 and September 30, 2017	between October 1, 2017 and September 30, 2018	on or after October 1, 2018		prior to June 15, 2015	prior to June 15, 2016	from June 15, 2015 through June 14, 2016	June 15, 2016 through June 14, 2017	June 15, 2016 through June 14, 2017	beginning on June 15, 2017	June 15, 2017 through June 14, 2018	June 15, 2018 through June 14, 2019	beginning on June 15, 2019	between December 15, 2016 and December 14, 2017	between December 15, 2017 and December 14, 2018	on or after December 15, 2018
Stated interest rate								6.75%				9.875%		9.00%			6.75%		4.00%					1.25%					8.75%	0.00%	7.00%	7.25%
Expected aggregate maturities in 2013	34,700,000
Expected aggregate maturities in 2014	20,600,000
Expected aggregate maturities in 2015	20,800,000
Expected aggregate maturities in 2016	620,900,000
Expected aggregate maturities in 2017	21,100,000
Debt assumed in acquisition														1,700,000		54,000,000			298,500,000
Calculated conversion rate														2,392.73414					2,614.6848
Principal Amount Increment For Conversion																				1,000
Amount of debt redeemed								450,000,000									500,000,000
Basis spread on variable rate																					4.50%		4.50%
Tender offer, offering price per unit of principal											1,002.50
Debt Instrument, Repurchased Face Amount								304,000,000
Debt instrument, repurchase amount									146,000,000	304,800,000
Net loss resulting from early retirement of debt and refinancing activities	23,668,000	1,958,000	6,776,000												(2,000,000)		(6,800,000)
Redemption Premium On Extinguishment Of Debt																	5,600,000
Write off of deferred debt issuance cost																	1,100,000	3,300,000							23,400,000
Debt Instrument, Unamortized Premium																	(800,000)	2,100,000
Deferred finance costs	101,500,000	90,500,000
Payments of Financing Costs	50,568,000	114,823,000	12,751,000
Debt Related Commitment Fees and Debt Issuance Costs		49,490,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage																											0.75%	0.50%
Debt Instrument, Unused Borrowing Capacity, Amount	333,000,000
Cash and cash equivalents	$ 784,622,000	$ 138,149,000	$ 93,593,000		$ 61,138,000
Line of Credit Facility, Covenant Terms	Terms of the Company's credit facilities and leases contain financial and other covenants that limit the ability of the Company to, among other things, acquire, dispose, merge or consolidate assets; incur additional debt; pay dividends and make distributions or repurchase stock; make investments; create liens; issue and sell capital stock of subsidiaries; enter into restrictions affecting the ability of restricted subsidiaries to make distributions, loans or advances to the Company; engage in transactions with affiliates and enter into sale and leaseback transactions. In addition, the covenants require the Company to pledge assets to collateralize the revolving credit and term loan facilities. The assets pledged include equity interests in wholly‑owned subsidiaries, certain real property interests, accounts receivable and inventory of the Company. Failure by the Company to comply with such covenants could result in an event of default, which, if not cured or waived, could have a material adverse effect on the Company.