Debt (Details) (USD $)			6 Months Ended		6 Months Ended		3 Months Ended		3 Months Ended		3 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Mortgage Notes Payable [Member]	Dec. 31, 2013 Mortgage Notes Payable [Member]	Jun. 30, 2014 Capital Lease Obligations [Member]	Dec. 31, 2013 Capital Lease Obligations [Member]	Jun. 30, 2014 Convertible Debt [Member]	Dec. 31, 2013 Convertible Debt [Member]	Jun. 30, 2014 Construction Financing [Member]	Dec. 31, 2013 Construction Financing [Member]	Jun. 30, 2014 Notes Payable, Insurance Premiums [Member]	Dec. 31, 2013 Notes Payable, Insurance Premiums [Member]
Long-Term Debt, Capital Leases and Financing Obligations [Line Items]
Debt	$ 2,635,491,000	$ 2,606,578,000	$ 2,025,362,000	$ 2,037,649,000	$ 312,178,000	$ 299,824,000	$ 266,794,000	$ 261,443,000	$ 28,453,000	$ 4,476,000	$ 2,704,000	$ 3,186,000
Less current portion	64,031,000	201,954,000
Long-term debt	2,571,460,000	2,404,624,000
Principal							316,300,000	316,300,000
Unamortized debt discount (premium)			$ 1,100,000				$ 49,500,000	$ 54,800,000
Maturity date					Dec. 31, 2026		Jun. 30, 2018				Dec. 31, 2014
Maturity date, start			Dec. 31, 2016						Dec. 31, 2017
Maturity date, end			Dec. 31, 2023						Dec. 31, 2027
Weighted average interest rate			4.03%	4.12%	8.05%	8.14%	2.75%	2.75%	5.20%	6.22%	2.65%	2.65%