Debt and Other Long-Term Liabilities (Schedule Of Debt And Other Long-Term Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013		Sep. 30, 2014 Senior Notes Senior Unsecured Notes due 2019		Dec. 31, 2013 Senior Notes Senior Unsecured Notes due 2019		Sep. 30, 2014 Senior Notes Senior Unsecured Notes due 2021		Jun. 30, 2014 Senior Notes Senior Unsecured Notes due 2021	Dec. 31, 2013 Convertible Notes		Sep. 30, 2014 Term Loans Credit Facility		Dec. 31, 2013 Term Loans Credit Facility		Sep. 30, 2014 Revolving Line of Credit Credit Facility		Dec. 31, 2013 Revolving Line of Credit Credit Facility
Debt
Principal	$ 1,008,125		$ 745,523		$ 350,000		$ 350,000		$ 300,000		$ 300,000	$ 51,148		$ 148,125		$ 344,375		$ 210,000		$ 0
Discount	(9,218)		(6,763)		(4,551)		(5,317)		(4,313)		(4,500)	(1,446)		(354)		0		0		0
Total	998,907		738,760		345,449		344,683		295,687			49,702		147,771		344,375		210,000		0
Less: current portion	(8,445)		(91,889)		0		0		0			(49,702)		(8,445)		(42,187)		0		0
Total long-term portion	990,462		646,871		345,449		344,683		295,687			0		139,326		302,188		210,000		0
Other Liabilities
Capital Lease Obligations	18,051		21,361
Capital Lease Obligations, Current	(12,150)		(11,997)
Capital Lease Obligations, Noncurrent	5,901		9,364
Asset retirement obligations	13,466		13,086
Asset Retirement Obligation, Current	0		0
Asset Retirement Obligations, Noncurrent	13,466		13,086
Other long-term liabilities	12,974		12,085
Other Long-term Liabilities, Current	0		(3)
Other Long-term Liabilities, Noncurrent	12,974		12,082
Long Term Debt And Other Long Term Liabilities	1,043,398		785,292
Current portion of long-term debt and other long-term liabilities	(20,595)		(103,889)
Long Term Debt And Other Liabilities Noncurrent	1,022,803		681,403
Unamortized deferred financing fees	$ 5,245	[1]	$ 5,026	[1]	$ 688	[1]	$ 832	[1]	$ 1,425	[1]		$ 186	[1]	$ 0	[1]	$ 1,259	[1]	$ 3,132	[1]	$ 2,749	[1]

[1] Deferred financing fees are recorded in other long-term assets in our Consolidated Balance Sheets and are amortized on a straight line basis over the life of the related loan.