Long-Term Debt (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Debt Instrument [Line Items]
Short-term Debt	$ 800,000
Principal payments on outstanding borrowings	700,000
Current maturities of long-term debt	29,967,000				36,225,000
3.00% Convertible Senior Notes due 2020 [Member]
Debt Instrument [Line Items]
Assessment Period For Fair Value	10 years
Debt Instrument, Interest Rate, Effective Percentage	8.25%
Initial conversion price per share	$ 48.37
Number of business days after trading day period	5 days
Number of trading days as observation period for determined weighted price of company's common stock	10 days
Principal amount of note to be considered under conversion rate	1,000
Maximum closing sale price under condition two	98.00%
Conversion value in cash	85,800,000
Number of common shares to be issued for per $ 1,000 principal amount of note	26.8778
Conversion price per share	$ 37.21
Maturity date of of notes	Mar. 15, 2020
Note agreement with a third party financial institution	115,000,000				115,000,000
Unamortized debt issuance cost	229,000				236,000
Total interest expense excluding amortization cost	863,000		863,000
Amortization cost of the 3.00% notes, 2.25% Notes and 8.25% Notes	899,000	[1]	785,000	[1]
Convertible Debt, Fair Value Disclosures	214,800,000				231,200,000
Other Real Estate Related Long Term Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Amount	162,200,000				164,100,000
Other Real Estate Related and Long-Term Debt	282,368,000				279,167,000
2.25% Convertible Senior Notes due 2036 [Member]
Debt Instrument [Line Items]
Assessment Period For Fair Value	10 years
Debt interest rate	2.25%
Debt Instrument, Interest Rate, Effective Percentage	7.50%
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%
Initial conversion price per share	$ 77.08
Number of business days after trading day period	5 days
Number of trading days as observation period for determined weighted price of company's common stock	10 days
Principal amount of note to be considered under conversion rate	1,000
Maximum closing sale price under condition two	98.00%
Conversion value in cash	17,500,000
Number of common shares to be issued for per $ 1,000 principal amount of note	16.8653
Conversion price per share	$ 59.29
Note agreement with a third party financial institution	182,753,000				182,753,000
Unamortized debt issuance cost	30,000				33,000
Total interest expense excluding amortization cost	1,028,000		1,028,000
Amortization cost of the 3.00% notes, 2.25% Notes and 8.25% Notes	2,012,000	[2]	1,826,000	[2]
Convertible Debt, Fair Value Disclosures	221,200,000				231,600,000
2.25% Convertible Senior Notes due 2036 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Minimum percentage of conversion price to be considered to redeem all or part of the notes	130.00%
Two Point Two Five Percent Warrants [Member]
Debt Instrument [Line Items]
Debt interest rate	2.25%
Three Point Zero Zero Percent Notes [Member]
Debt Instrument [Line Items]
Debt interest rate	3.00%
Mortgage Facility Real Estate Related Debt and Acquisition Line [Member]
Debt Instrument [Line Items]
Term loans provided under credit facility	74,100,000
Amount available to be expanded	99,100,000
Unamortized debt issuance cost	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%
Borrowings under amended and restated mortgage facility	200,000
Current maturities of long-term debt	3,500,000
Total borrowings	67,200,000
2.25% Purchased Options [Member]
Debt Instrument [Line Items]
Debt interest rate	2.25%
Maximum number of shares of common stock required to be issued under warrants	3,100,000
2.25% Warrants [Member]
Debt Instrument [Line Items]
Exercise price per common stock under warrants	80.12
3.00% Warrants [Member]
Debt Instrument [Line Items]
Debt interest rate	3.00%
Exercise price per common stock under warrants	54.67
3.00% Purchased Options [Member]
Debt Instrument [Line Items]
Debt interest rate	3.00%
Maximum number of shares of common stock required to be issued under warrants	3,100,000
Real Estate Related Debt [Member]
Debt Instrument [Line Items]
Capitalization Of Debt Issuance Costs	1,300,000
Unamortized debt issuance cost	700,000
Interest on real estate notes, minimum	3.67%
Interest on real estate notes, maximum	9.00%
Amortization schedule	20 years
Real Estate Related Debt [Member] | Minimum [Member]
Debt Instrument [Line Items]
Variable Interest Rate	1.95%
Real Estate Related Debt [Member] | Maximum [Member]
Debt Instrument [Line Items]
Variable Interest Rate	3.35%
Real Estate Related Debt [Member] | Toyota Motor Credit Corporation [Member]
Debt Instrument [Line Items]
Current maturities of long-term debt	7,000,000
Amortization schedule	20 years
Total borrowings	51,200,000
Number of loans as per loan agreements	8
Real Estate Related Debt [Member] | Mercedes-Benz Financial Services [Member]
Debt Instrument [Line Items]
Current maturities of long-term debt	1,700,000
Total borrowings	45,100,000
Number of loans as per loan agreements	3
Real Estate Related Debt [Member] | BMW Financial Services [Member]
Debt Instrument [Line Items]
Current maturities of long-term debt	4,200,000
Amortization schedule	15 years
Total borrowings	69,100,000
Number of loans as per loan agreements	14
Real Estate Related Debt [Member] | Ford Motor Credit [Member]
Debt Instrument [Line Items]
Amortization schedule	11 years
Foreign Note [Member]
Debt Instrument [Line Items]
Current maturities of long-term debt	3,900,000
Total borrowings	30,500,000
Third-party financial institution [Member]
Debt Instrument [Line Items]
Term loans provided under credit facility	71,900,000
Current maturities of long-term debt	3,600,000
Total borrowings	63,500,000
Number of loans as per loan agreements	13
Third-party financial institution [Member] | Ford Motor Credit [Member]
Debt Instrument [Line Items]
Current maturities of long-term debt	800,000
Total borrowings	19,000,000
Number of loans as per loan agreements	2
Real Estate Credit Facility [Member]
Debt Instrument [Line Items]
Capitalization Of Debt Issuance Costs	1,100,000
Real Estate Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Ending date of installments to be repaid	Dec. 29, 2015
Real Estate Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Ending date of installments to be repaid	Feb. 27, 2017
London Interbank Offered Rate (LIBOR) [Member] | Mortgage Facility Real Estate Related Debt and Acquisition Line [Member]
Debt Instrument [Line Items]
Variable Interest Rate	2.00%
Federal Funds Rate [Member] | Mortgage Facility Real Estate Related Debt and Acquisition Line [Member]
Debt Instrument [Line Items]
Variable Interest Rate	0.50%
Fixed interest rate debt [Member] | Other Real Estate Related Long Term Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Fair Value	$ 187,900,000				$ 190,000,000

[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.