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Debt (Details) - USD ($) $ in Thousands | Sep. 30, 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 | $ 5,515,367 | $ 6,045,167
Less current portion | 646,504 | 215,255
Total long-term debt and capital and financing lease obligations, less current portion | 4,868,863 | 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 | 3,550,927 | 3,184,229
Unamortized debt discount | $ 15,600 | $ 4,500
Weighted average interest rate | 4.58% | 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 | $ 1,577,589 | $ 2,485,520
Weighted average interest rate | 7.95% | 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 | $ 306,145 | $ 295,397
Principal | 316,300 | 316,300
Unamortized debt discount | $ 10,100 | $ 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 | $ 0 | $ 3,644
Weighted average interest rate |  | 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 | $ 4,347 | $ 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 | $ 76,359 | $ 76,377
Weighted average interest rate | 5.80% | 5.33%

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