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Long-Term Debt (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  | 9 Months Ended |  |  |  |  | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Real Estate Related Debt [Member] | Sep. 30, 2014 2.25% Convertible Senior Notes due 2036 [Member] | Sep. 30, 2014 2.25% Convertible Senior Notes due 2036 [Member] | Sep. 30, 2014 2.25% Convertible Senior Notes due 2036 [Member] | Sep. 02, 2014 2.25% Convertible Senior Notes due 2036 [Member] | Dec. 31, 2013 2.25% Convertible Senior Notes due 2036 [Member] | Sep. 30, 2014 3.00% Convertible Senior Notes due 2020 [Member] | Jul. 30, 2014 3.00% Convertible Senior Notes due 2020 [Member] | Jun. 30, 2014 3.00% Convertible Senior Notes due 2020 [Member] | Sep. 30, 2014 3.00% Convertible Senior Notes due 2020 [Member] | Jun. 25, 2014 3.00% Convertible Senior Notes due 2020 [Member] | Dec. 31, 2013 3.00% Convertible Senior Notes due 2020 [Member] | Sep. 30, 2014 Mortgages [Member] | Dec. 31, 2013 Mortgages [Member] | Sep. 30, 2014 5.00% Senior Note [Member] | Jun. 30, 2014 5.00% Senior Note [Member] | Sep. 30, 2014 5.00% Senior Note [Member] | Dec. 31, 2013 5.00% Senior Note [Member] | Sep. 30, 2014 Real Estate Credit Facility [Member] | Sep. 30, 2014 Other Real Estate Related Long-Term Debt [Member] | Dec. 31, 2013 Other Real Estate Related Long-Term Debt [Member] | Sep. 30, 2014 Capital Lease Obligations [Member] | Dec. 31, 2013 Capital Lease Obligations [Member] | Sep. 30, 2014 Third Party Financial Institution [Member] | Sep. 30, 2014 Foreign Note [Member] | Sep. 30, 2014 Ford Motor Credit Company [Member] Real Estate Related Debt [Member] | Sep. 30, 2014 Ford Motor Credit Company [Member] Third Party Financial Institution [Member] | Sep. 30, 2014 Bmw Financial Services [Member] Real Estate Related Debt [Member] | Sep. 30, 2014 Mercedes Benz Financial Services [Member] Real Estate Related Debt [Member] | Sep. 30, 2014 Toyota Motor Credit Corporation [Member] Real Estate Related Debt [Member] | Sep. 30, 2014 Maximum [Member] Real Estate Credit Facility [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Call options duration |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings Under Amended And Restated Mortgage Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  |  |  |  |  | 22,600,000 |  | 92,500,000 | 22,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings Of Long Term Debt Related To Real Estate Loans |  |  | 65,628,000 | 21,105,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,900,000 | 6,800,000 |  | 13,800,000 | 0 | 0 | 0 |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,500,000 | 2,900,000 | 600,000 |  | 3,400,000 | 17,900,000 |  |
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,400,000 |
Debt Instrument, Face Amount |  |  |  |  |  |  | 182,800,000 | 182,800,000 | 182,800,000 | 182,500,000 |  |  |  |  |  | 115,000,000 |  |  |  | 550,000,000 | 350,000,000 | 550,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Maturity Date Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 01, 2022 |  |  |  |  |  |  | Nov. 01, 2022 | Aug. 01, 2027 | Jan. 01, 2024 |  | Sep. 01, 2019 | Jan. 01, 2031 | Sep. 01, 2020 | Feb. 27, 2017
Repayments of Convertible Debt |  |  |  |  |  |  | 237,500,000 |  |  |  |  |  |  |  |  |  |  |  |  | 49,500,000 | 210,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Long-term Debt, Noncurrent |  |  |  |  |  |  | 0 | 0 | 0 |  | 160,334,000 | 0 |  |  | 0 |  | 84,305,000 |  |  | 539,822,000 |  | 539,822,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Other Real Estate Related and Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58,838,000 | 67,719,000 |  |  |  |  |  | 316,703,000 | 279,167,000 |  |  |  |  |  |  |  |  |  |
Capital lease obligations related to real estate, maturing in varying amounts through June 2034 with a weighted average interest rate of 10.3% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 57,655,000 | 47,553,000 |  |  |  |  |  |  |  |
Net carrying amount of liability component | 973,018,000 |  | 973,018,000 |  | 699,078,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less current maturities of mortgage facility and other long-term debt | 34,519,000 |  | 34,519,000 |  | 35,389,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT, net of current maturities | 938,499,000 |  | 938,499,000 |  | 663,689,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.60% |  |  |  |  |  |  |  |  |
Allocated Underwriter Fees Net Of Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,400,000 |  | 10,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,200,000 |  | 10,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalization Of Debt Issuance Costs |  |  |  |  |  | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,200,000 |  | 2,200,000 |  | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 |  | 2,100,000 |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt | (22,790,000) | 0 | (46,403,000) | 0 |  |  |  | 16,900,000 |  |  |  | 5,900,000 |  | 23,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  |  |  |  |  |  |  |  | $ 6,200,000 | $ 26,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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