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Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Long-Term Debt, Capital and Financing Leases and Financing Obligations [Line Items]
Total long-term debt and capital and financing lease obligations	$ 5,167,203	$ 6,045,167
Less current portion	233,548	215,255
Total long-term debt and capital and financing lease obligations, less current portion	4,933,655	5,829,912
Mortgage Notes Payable [Member]
Long-Term Debt, Capital and Financing Leases and Financing Obligations [Line Items]
Total long-term debt and capital and financing lease obligations	3,167,914	3,184,229
Unamortized debt discount	$ 6,100	$ 4,500
Weighted average interest rate	4.61%	4.50%
Capital and Financing Lease Obligations [Member]
Long-Term Debt, Capital and Financing Leases and Financing Obligations [Line Items]
Total long-term debt and capital and financing lease obligations	$ 1,603,150	$ 2,485,520
Weighted average interest rate	7.90%	8.08%
Convertible Debt [Member]
Long-Term Debt, Capital and Financing Leases and Financing Obligations [Line Items]
Total long-term debt and capital and financing lease obligations	$ 298,918	$ 295,397
Principal	316,300	316,300
Unamortized debt discount	$ 17,300	$ 20,900
Weighted average interest rate	2.75%	2.75%
Construction Financing [Member]
Long-Term Debt, Capital and Financing Leases and Financing Obligations [Line Items]
Total long-term debt and capital and financing lease obligations	$ 6,088	$ 3,644
Weighted average interest rate	8.00%	8.00%
Notes Payable, Insurance Premiums [Member]
Long-Term Debt, Capital and Financing Leases and Financing Obligations [Line Items]
Total long-term debt and capital and financing lease obligations	$ 17,262	$ 0
Weighted average interest rate	2.94%
Other Notes Payable [Member]
Long-Term Debt, Capital and Financing Leases and Financing Obligations [Line Items]
Total long-term debt and capital and financing lease obligations	$ 73,871	$ 76,377
Weighted average interest rate	6.04%	5.33%

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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