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Long-Term Debt (Details Textual)
 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
USD ($)
Jun. 30, 2013
USD ($)
Dec. 31, 2013
USD ($)
Jun. 30, 2014
3.00% Convertible Senior Notes due 2020 [Member]
USD ($)
Jun. 30, 2014
3.00% Convertible Senior Notes due 2020 [Member]
USD ($)
Jun. 30, 2013
3.00% Convertible Senior Notes due 2020 [Member]
USD ($)
Jun. 25, 2014
3.00% Convertible Senior Notes due 2020 [Member]
USD ($)
Dec. 31, 2013
3.00% Convertible Senior Notes due 2020 [Member]
USD ($)
Jun. 30, 2014
5.00% Senior Note [Member]
USD ($)
Jun. 30, 2014
Other Real Estate Related Long Term Debt [Member]
USD ($)
Dec. 31, 2013
Other Real Estate Related Long Term Debt [Member]
USD ($)
Jun. 30, 2014
2.25% Convertible Senior Notes due 2036 [Member]
USD ($)
Jun. 30, 2014
2.25% Convertible Senior Notes due 2036 [Member]
USD ($)
Jun. 30, 2013
2.25% Convertible Senior Notes due 2036 [Member]
USD ($)
Dec. 31, 2013
2.25% Convertible Senior Notes due 2036 [Member]
USD ($)
Jun. 30, 2014
2.25% Convertible Senior Notes due 2036 [Member]
Minimum [Member]
Jun. 30, 2014
Two Point Two Five Percent Warrants [Member]
Jun. 30, 2014
Three Point Zero Zero Percent Notes [Member]
Jun. 30, 2014
2.25% Warrants [Member]
Jun. 30, 2014
3.00% Warrants [Member]
Jun. 30, 2014
3.00% Purchased Options [Member]
Jun. 30, 2014
Real Estate Related Debt [Member]
USD ($)
Jun. 30, 2014
Real Estate Related Debt [Member]
Minimum [Member]
Jun. 30, 2014
Real Estate Related Debt [Member]
Maximum [Member]
Jun. 30, 2014
Real Estate Related Debt [Member]
Toyota Motor Credit Corporation [Member]
USD ($)
Jun. 30, 2014
Real Estate Related Debt [Member]
Toyota Motor Credit Corporation [Member]
USD ($)
Jun. 30, 2014
Real Estate Related Debt [Member]
Mercedes-Benz Financial Services [Member]
USD ($)
Jun. 30, 2014
Real Estate Related Debt [Member]
Mercedes-Benz Financial Services [Member]
USD ($)
Jun. 30, 2014
Real Estate Related Debt [Member]
BMW Financial Services [Member]
USD ($)
Jun. 30, 2014
Real Estate Related Debt [Member]
BMW Financial Services [Member]
USD ($)
Jun. 30, 2014
Real Estate Related Debt [Member]
Ford Motor Credit Company [Member]
Jun. 30, 2014
Real Estate Related Debt [Member]
Ford Motor Credit Company [Member]
Jun. 30, 2014
Foreign Note [Member]
USD ($)
Jun. 30, 2014
Brazilian third party financial institution [Member]
BRL
Jun. 30, 2014
Third-party financial institution [Member]
USD ($)
Jun. 30, 2014
Third-party financial institution [Member]
USD ($)
Jun. 30, 2014
Third-party financial institution [Member]
Ford Motor Credit Company [Member]
USD ($)
Jun. 30, 2014
Third-party financial institution [Member]
Ford Motor Credit Company [Member]
USD ($)
Jun. 30, 2014
Real Estate Credit Facility [Member]
USD ($)
Jun. 30, 2014
Real Estate Credit Facility [Member]
USD ($)
Jun. 30, 2014
Real Estate Credit Facility [Member]
Minimum [Member]
Jun. 30, 2014
Real Estate Credit Facility [Member]
Maximum [Member]
Jun. 30, 2014
2.25% Purchased Options [Member]
Jun. 30, 2014
London Interbank Offered Rate (LIBOR) [Member]
Real Estate Credit Facility [Member]
Jun. 30, 2014
Federal Funds Rate [Member]
Real Estate Credit Facility [Member]
Jun. 30, 2014
Fixed interest rate debt [Member]
Other Real Estate Related Long Term Debt [Member]
USD ($)
Dec. 31, 2013
Fixed interest rate debt [Member]
Other Real Estate Related Long Term Debt [Member]
USD ($)
Jul. 03, 2014
Subsequent Event [Member]
3.00% Purchased Options [Member]
Debt Instrument [Line Items]                                                                                                
Amortization period of underwriters fees and debt issuance costs 8 years                                                                                              
Original Debt Instrument Interest Rate Effective Percentage       8.25% 8.25%             7.50% 7.50%                                                                      
Long-term Debt, Percentage Bearing Fixed Interest, Amount                   $ 160,200,000 $ 164,100,000                                                                          
Long-term Debt, Fair Value                                                                                           185,800,000 190,000,000  
Assessment Period For Fair Value       10 years               10 years                                                                        
Debt interest rate                       2.25% 2.25%       2.25% 3.00%   3.00% 3.00%                                           2.25%          
Dividend threshold for adjustment to conversion price                       $ 0.14                                                                        
Minimum trading days for conversion price                       20 days                                                                        
Maximum trading days for conversion price under redemption condition                       30 days                                                                        
Minimum percentage of conversion price to be considered to redeem all or part of the notes                       130.00%       130.00%                                                                
Initial conversion price per share       $ 48.26               $ 77.05                                                                        
Number of business days after trading day period       5 days               5 days                                                                        
Number of trading days as observation period for determined weighted price of company's common stock       10 days               10 days                                                                        
Principal amount of note to be considered under conversion rate       1,000 1,000             1,000 1,000                                                                      
Maximum closing sale price under condition two       98.00%               98.00%                                                                        
Conversion value in cash       28,500,000               76,200,000                                                                        
Number of common shares to be issued for per $ 1,000 principal amount of note       26.9352               16.8653                                                                        
Conversion price per share       $ 37.13 $ 37.13             $ 59.27 $ 59.27                                                                      
Exercise price per common stock under warrants                                     80.09 54.55                                                        
Maximum number of shares of common stock required to be issued under warrants                                         3,100,000                                           3,100,000         600,000
purchase options settled                                                                                               2,500,000
Maturity date of of notes       Mar. 15, 2020                                                                                        
Note agreement with a third party financial institution       22,550,000 22,550,000   115,000,000 115,000,000 350,000,000     182,753,000 182,753,000   182,753,000                                                                  
Term loans provided under credit facility                                                                     90,600,000 90,600,000     74,100,000 74,100,000                
Capitalization Of Debt Issuance Costs                 1,500,000                         1,300,000                                 1,100,000 1,100,000                
Amount available to be expanded                                                                             99,100,000 99,100,000                
Unamortized debt issuance cost       44,000 44,000     236,000 1,500,000     27,000 27,000   33,000             600,000                                 500,000 500,000                
Interest rate under condition second                                                                             0.95%                  
Interest rate under sub-condition three of condition second                                                                                       1.05%        
Percentage of principal payments to make its quarterly payment                                                                             1.25%                  
Ending date of installments to be repaid                 Jun. 01, 2022                                 Sep. 01, 2020   Dec. 01, 2030   Sep. 01, 2019   Jan. 01, 2024 Aug. 01, 2027 Feb. 01, 2017   Nov. 01, 2022         Dec. 29, 2015 Feb. 27, 2017            
Borrowings under amended and restated mortgage facility                                                                               200,000                
Principal payments on outstanding borrowings                                                                               1,600,000                
Current maturities of long-term debt 30,516,000   36,225,000                                           7,000,000 7,000,000 1,700,000 1,700,000 4,200,000 4,200,000     4,000,000   4,600,000 4,600,000 800,000 800,000 3,500,000 3,500,000                
Interest on real estate notes, minimum                                           3.67%                                                    
Interest on real estate notes, maximum                                           9.00%                                                    
Total interest expense excluding amortization cost         1,679,000 1,725,000             2,056,000 2,056,000                                                                    
Amortization schedule                                                 20 years   20 years   15 years   11 years                                  
Amortization cost of the 3.00% notes, 2.25% Notes and 8.25% Notes         1,693,000 [1] 1,588,000 [1]             3,998,000 [2] 3,689,000 [2]                                                                    
Variable Interest Rate                                             1.90% 3.35%                               2.00%         0.50%      
Total borrowings                                                 50,800,000 50,800,000 44,700,000 44,700,000 68,100,000 68,100,000     30,200,000 22,000,000 81,200,000 81,200,000 18,900,000 18,900,000 66,300,000 66,300,000                
Convertible Debt, Fair Value Disclosures       52,900,000 52,900,000     231,200,000 351,800,000     261,200,000 261,200,000   231,600,000                                                                  
Other Real Estate Related and Long-Term Debt                   307,738,000 279,167,000                                                                          
Number of loans as per loan agreements                                                 8   3   14           14   2                      
Borrowings Of Long Term Debt Related To Real Estate Loans $ 32,559,000 $ 6,008,000                                               $ 0   $ 0   $ 0     $ 0     $ 18,700,000   $ 13,800,000                    
[1] Represents the incremental impact of the accounting for convertible debt as primarily codified in ASC 470, Debt
[2] Represents the incremental impact of the accounting for convertible debt as primarily codified in ASC 470, Debt.