Debt And Financing (Details) (USD $)	3 Months Ended							1 Months Ended	3 Months Ended																						3 Months Ended		12 Months Ended					3 Months Ended			0 Months Ended	3 Months Ended							3 Months Ended	12 Months Ended	3 Months Ended			12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Carrying Amount [Member]	Dec. 31, 2013 Carrying Amount [Member]	Mar. 31, 2014 Fair Value [Member]	Dec. 31, 2013 Fair Value [Member]	Feb. 28, 2014 Series A Note [Member]	Mar. 31, 2014 Series A Note [Member]	Mar. 31, 2014 2014 Term Loan [Domain] [Domain]	Mar. 31, 2014 2014 Term Loan [Domain] [Domain] Carrying Amount [Member]	Dec. 31, 2013 2014 Term Loan [Domain] [Domain] Carrying Amount [Member]	Mar. 31, 2014 2014 Term Loan [Domain] [Domain] Fair Value [Member]	Dec. 31, 2013 2014 Term Loan [Domain] [Domain] Fair Value [Member]	Dec. 31, 2013 Restructured Term Loan [Member]	Mar. 31, 2014 Restructured Term Loan [Member] Carrying Amount [Member]	Dec. 31, 2013 Restructured Term Loan [Member] Carrying Amount [Member]	Mar. 31, 2014 Restructured Term Loan [Member] Fair Value [Member]	Dec. 31, 2013 Restructured Term Loan [Member] Fair Value [Member]	Mar. 31, 2014 2014 ABL Facility Credit Agreement [Member] [Member] Carrying Amount [Member]	Dec. 31, 2013 2014 ABL Facility Credit Agreement [Member] [Member] Carrying Amount [Member]	Mar. 31, 2014 2014 ABL Facility Credit Agreement [Member] [Member] Fair Value [Member]	Dec. 31, 2013 2014 ABL Facility Credit Agreement [Member] [Member] Fair Value [Member]	Mar. 31, 2014 Line of Credit [Member] 2014 ABL Facility Credit Agreement [Member] [Member]		Mar. 31, 2014 Line of Credit [Member] ABL facility - Term A [Member]	Dec. 31, 2013 Line of Credit [Member] ABL facility - Term A [Member]	Mar. 31, 2014 Line of Credit [Member] ABL facility - Term B [Member]	Dec. 31, 2013 Line of Credit [Member] ABL facility - Term B [Member]	Mar. 31, 2014 Letter of Credit [Member] 2014 ABL Facility Credit Agreement [Member] [Member]	Mar. 31, 2014 Pension Contribution Deferral Obligation [Member]	Dec. 31, 2013 Pension Contribution Deferral Obligation [Member]	Dec. 31, 2013 A&R CDA	Mar. 31, 2014 Senior Notes [Member] Carrying Amount [Member]	Dec. 31, 2013 Senior Notes [Member] Carrying Amount [Member]	Mar. 31, 2014 Senior Notes [Member] Fair Value [Member]	Dec. 31, 2013 Senior Notes [Member] Fair Value [Member]	Mar. 31, 2014 Senior Notes [Member] Senior A Notes [Member]	Mar. 31, 2014 Senior Notes [Member] Senior A Notes [Member]	Dec. 31, 2013 Senior Notes [Member] Senior A Notes [Member]	Feb. 13, 2014 Senior Notes [Member] Senior B Notes	Mar. 31, 2014 Senior Notes [Member] Senior B Notes	Mar. 31, 2014 Senior Notes [Member] Senior B Notes	Mar. 31, 2013 Senior Notes [Member] Senior B Notes	Jan. 31, 2014 Senior Notes [Member] Senior B Notes	Dec. 31, 2013 Senior Notes [Member] Senior B Notes	Mar. 31, 2014 Senior Notes [Member] Senior B Notes [Domain]	Dec. 31, 2013 Senior Notes [Member] Senior B Notes [Domain]	Mar. 31, 2014 Senior Notes [Member] 5.0% and 3.375% contingent convertible senior notes [Member]	Dec. 31, 2013 Senior Notes [Member] 5.0% and 3.375% contingent convertible senior notes [Member]	Mar. 31, 2014 Secured Second A&R CDA [Member]	Mar. 31, 2014 Unsecured Second A&R CD [Member]	Mar. 31, 2014 Lease Financing Obligations [Member]	Dec. 31, 2013 Lease Financing Obligations [Member]	Mar. 31, 2014 Lease Financing Obligations [Member] Carrying Amount [Member]	Dec. 31, 2013 Lease Financing Obligations [Member] Carrying Amount [Member]	Mar. 31, 2014 Lease Financing Obligations [Member] Fair Value [Member]	Dec. 31, 2013 Lease Financing Obligations [Member] Fair Value [Member]	Mar. 31, 2014 Other Debt Obligations [Member]	Dec. 31, 2013 Other Debt Obligations [Member]	Mar. 31, 2014 Other Debt Obligations [Member] Carrying Amount [Member]	Dec. 31, 2013 Other Debt Obligations [Member] Carrying Amount [Member]	Mar. 31, 2014 Other Debt Obligations [Member] Fair Value [Member]	Dec. 31, 2013 Other Debt Obligations [Member] Fair Value [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 1,221,000,000		$ 1,361,300,000							$ 698,200,000					$ 298,100,000									$ 0	[1]		$ 105,000,000		$ 219,900,000			$ 124,200,000						$ 86,700,000	$ 86,700,000	$ 177,800,000		$ 16,500,000.0	$ 16,500,000.0			$ 69,200,000		$ 69,400,000			$ 51,000,000	$ 73,200,000	$ 295,200,000	$ 297,500,000					$ 200,000	$ 200,000
Premium/(Discount), Debt	(16,100,000)		2,100,000							(6,800,000)					37,700,000									0	[1]		(2,100,000)		(3,900,000)			(200,000)						(7,000,000)	(7,000,000)	(17,800,000)		(2,300,000)	(2,300,000)			(10,500,000)		(1,100,000)			0	0	0	0					0	0
Book Value	1,204,900,000		1,363,400,000							691,400,000					335,800,000									0	[1]		102,900,000		216,000,000			124,000,000						79,700,000	79,700,000	160,000,000		14,200,000	14,200,000			58,700,000		68,300,000			51,000,000	73,200,000	295,200,000	297,500,000					200,000	200,000
Debt Instrument, Gross, Current Maturities										(7,000,000)																												(86,700,000)	(86,700,000)			(16,500,000)	(16,500,000)										(6,300,000)	(8,400,000)					(200,000)	(200,000)
Premium/(Discount), Current Maturities										0																												7,000,000	7,000,000			2,300,000	2,300,000										0	0					0	0
Book Value, Current Maturities	(107,400,000)		(8,600,000)							(7,000,000)																												(79,700,000)	(79,700,000)			(14,200,000)	(14,200,000)										(6,300,000)	(8,400,000)					(200,000)	(200,000)
Par Value, Excluding Current Maturities	1,104,300,000		1,352,700,000
Debt Instrument, Unamortized Discount (Premium), Net, Noncurrent Maturities	6,800,000		(2,100,000)
Book Value, Excluding Current Maturities	1,097,500,000		1,354,800,000
Stated Interest Rate										8.00%					10.00%									2.65%	[1]		8.50%		11.25%									10.00%	10.00%	10.00%		10.00%	10.00%			10.00%	6.00%	6.00%
Effective Interest Rate										8.20%					0.00%									2.70%	[1]		15.80%		15.00%			7.30%						18.30%	18.30%	18.30%		25.60%	25.60%			25.60%		15.50%			7.30%	7.30%	11.90%	11.90%
Debt Instrument, Convertible, Conversion Price, Future Period																																						$ 34.0059	$ 34.0059			$ 18.5334	$ 18.5334		$ 15.00
Debt Instrument, Convertible, Conversion Price																																										$ 16.8103	$ 16.8103
Number of shares converted per thousand																																										59.4873	59.4873
Conversion of Stock, Shares Converted																																										75,900	75,900	398,000
Interest Expense, Debt																																											400,000	3,400,000
Make Whole Premium																																											200,000	1,600,000
Amortization of Debt Discount (Premium)	17,700,000	1,400,000																																									200,000	1,800,000
Debt Instrument, Convertible, Number Of Equity Instruments, Outstanding																																										981,000	981,000
Debt Conversion, Convertible, Number of Equity Instruments, Subsequent Month																																						0	0			0	0
Debt Instrument, Convertible, Conversion Ratio, Future Period																																						0.0294067	29.4067			0.0539567	53.9567
Future Repayments of Series A Notes								89,600,000	89,600,000
Debt Instrument, Convertible, Conversion Ratio																																										0.0594873	0.0594873
Debt Conversion, Converted Instrument, Amount																																									50,600,000		1,200,000	5,800,000
Stated Interest Rate, Minimum																																	3.25%																5.00%	5.00%	3.30%	3.30%	10.00%	10.00%
Stated Interest Rate, Maximum																																	18.30%																3.375%	3.375%	18.30%	18.30%	18.20%	18.20%
Borrowing Base																								450,000,000		0	156,500,000		219,900,000
Line Of Credit Facility, Total Availability																								82,500,000		0	51,500,000		0
Letters of Credit Outstanding, Amount																														367,500,000
Capacity																								450,000,000		0	175,000,000		219,900,000
Long-term Debt, Fair Value				$ 1,204,900,000	$ 1,363,400,000	$ 1,227,800,000	$ 1,318,400,000				$ 691,400,000	$ 0	$ 704,000,000	$ 0		$ 0	$ 335,800,000	$ 0	$ 289,200,000	$ 0	$ 318,900,000	$ 0	$ 326,100,000											$ 93,900,000	$ 218,700,000	$ 103,200,000	$ 225,800,000																		$ 295,200,000	$ 297,500,000	$ 295,200,000	$ 297,500,000			$ 124,400,000	$ 192,500,000	$ 125,400,000	$ 179,800,000

[1] As of March 31, 2014, the borrowing base on our New ABL Facility was $450.0 million. The availability of $82.5 million is derived by reducing the borrowing base by our $367.5 million of outstanding letters of credit as of March 31, 2014.