Long-Term Debt (Details Textual)	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						3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2014 3.00% Convertible Senior Notes due 2020 [Member] USD ($)	Jul. 30, 2014 3.00% Convertible Senior Notes due 2020 [Member] USD ($)	Sep. 30, 2014 3.00% Convertible Senior Notes due 2020 [Member]	Jun. 30, 2014 3.00% Convertible Senior Notes due 2020 [Member] USD ($)	Sep. 30, 2014 3.00% Convertible Senior Notes due 2020 [Member] USD ($)		Sep. 30, 2013 3.00% Convertible Senior Notes due 2020 [Member] USD ($)		Jun. 25, 2014 3.00% Convertible Senior Notes due 2020 [Member] USD ($)	Sep. 30, 2014 5.00% Senior Note [Member] USD ($)	Sep. 30, 2014 5.00% Senior Note [Member] USD ($)	Jun. 30, 2014 5.00% Senior Note [Member] USD ($)	Sep. 30, 2014 5.00% Senior Note [Member] USD ($)	Sep. 30, 2014 Other Real Estate Related Long Term Debt [Member] USD ($)	Dec. 31, 2013 Other Real Estate Related Long Term Debt [Member] USD ($)	Sep. 30, 2014 2.25% Convertible Senior Notes due 2036 [Member] USD ($)	Sep. 30, 2014 2.25% Convertible Senior Notes due 2036 [Member] USD ($)	Sep. 30, 2014 2.25% Convertible Senior Notes due 2036 [Member] USD ($)	Sep. 30, 2013 2.25% Convertible Senior Notes due 2036 [Member] USD ($)	Sep. 02, 2014 2.25% Convertible Senior Notes due 2036 [Member] USD ($)	Sep. 30, 2014 Two Point Two Five Percent Warrants [Member]	Sep. 30, 2014 Three Point Zero Zero Percent Notes [Member]	Sep. 30, 2014 3.00% Warrants [Member]	Sep. 30, 2014 Real Estate Related Debt [Member] USD ($)	Sep. 30, 2014 Real Estate Related Debt [Member] Minimum [Member]	Sep. 30, 2014 Real Estate Related Debt [Member] Maximum [Member]	Sep. 30, 2014 Real Estate Related Debt [Member] Toyota Motor Credit Corporation [Member] USD ($)	Sep. 30, 2014 Real Estate Related Debt [Member] Toyota Motor Credit Corporation [Member] USD ($)	Sep. 30, 2014 Real Estate Related Debt [Member] Mercedes-Benz Financial Services [Member] USD ($)	Sep. 30, 2014 Real Estate Related Debt [Member] Mercedes-Benz Financial Services [Member] USD ($)	Sep. 30, 2014 Real Estate Related Debt [Member] BMW Financial Services [Member] USD ($)	Sep. 30, 2014 Real Estate Related Debt [Member] BMW Financial Services [Member] USD ($)	Sep. 30, 2014 Real Estate Related Debt [Member] Ford Motor Credit Company [Member]	Sep. 30, 2014 Real Estate Related Debt [Member] Ford Motor Credit Company [Member]	Sep. 30, 2014 Foreign Note [Member] USD ($)	Sep. 30, 2014 Brazilian third party financial institution [Member] BRL	Sep. 30, 2014 Third-party financial institution [Member] USD ($)	Sep. 30, 2014 Third-party financial institution [Member] USD ($)	Sep. 30, 2014 Third-party financial institution [Member] Ford Motor Credit Company [Member] USD ($)	Sep. 30, 2014 Third-party financial institution [Member] Ford Motor Credit Company [Member] USD ($)	Sep. 30, 2014 Real Estate Credit Facility [Member] USD ($)	Sep. 30, 2014 Real Estate Credit Facility [Member] USD ($)	Sep. 30, 2014 Real Estate Credit Facility [Member] Minimum [Member]	Sep. 30, 2014 Real Estate Credit Facility [Member] Maximum [Member]	Sep. 30, 2014 London Interbank Offered Rate (LIBOR) [Member] Real Estate Credit Facility [Member]	Sep. 30, 2014 Federal Funds Rate [Member] Real Estate Credit Facility [Member]	Sep. 30, 2014 Fixed interest rate debt [Member] Other Real Estate Related Long Term Debt [Member] USD ($)	Dec. 31, 2013 Fixed interest rate debt [Member] Other Real Estate Related Long Term Debt [Member] USD ($)
Debt Instrument [Line Items]
Repayments of Convertible Debt															$ 49,500,000		$ 210,400,000				$ 237,500,000
Gains (Losses) on Extinguishment of Debt	(22,790,000)	0	(46,403,000)	0		5,900,000			23,600,000													16,900,000
Proceeds from Warrant Exercises						6,200,000	26,400,000
Short-term Debt	6,500,000		6,500,000		800,000
Amortization period of underwriters fees and debt issuance costs			8 years
Original Debt Instrument Interest Rate Effective Percentage						8.25%		8.25%		8.25%											7.50%	7.50%	7.50%
Long-term Debt, Percentage Bearing Fixed Interest, Amount																			153,900,000	164,100,000
Long-term Debt, Fair Value																																																				174,400,000	190,000,000
Assessment Period For Fair Value								10 years														10 years
Debt interest rate																					2.25%	2.25%	2.25%			2.25%	3.00%	3.00%
Maturity date of of notes								Mar. 15, 2020
Note agreement with a third party financial institution														115,000,000	550,000,000	550,000,000	350,000,000	550,000,000			182,800,000	182,800,000	182,800,000		182,500,000
Additional borrowings of long term debt																200,000,000
Additional borrowings discount from face value															1.50%	1.50%		1.50%
Debt Conversion, Converted Instrument, Shares Issued	701,795
Debt Conversion, Converted Instrument, Warrants or Options Issued	421,309
Term loans provided under credit facility																																										109,800,000	109,800,000			74,100,000	74,100,000
Capitalization Of Debt Issuance Costs															2,200,000	2,200,000		2,200,000											1,300,000																	1,100,000	1,100,000
Amount available to be expanded																																														99,100,000	99,100,000
Unamortized debt issuance cost															2,100,000	2,100,000		2,100,000											500,000																	400,000	400,000
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		Jan. 01, 2031		Sep. 01, 2019		Jan. 01, 2024	Aug. 01, 2027	Feb. 01, 2017		Nov. 01, 2022					Dec. 29, 2015	Feb. 27, 2017
Redemption price percentage of principal outstanding and accrued unpaid interest															105.00%	105.00%		105.00%
Redemption price percentage of principal redeemed															100.00%	100.00%		100.00%
Borrowings under amended and restated mortgage facility																																															200,000
Principal payments on outstanding borrowings																																															9,100,000
Current maturities of long-term debt	41,021,000		41,021,000		36,225,000																											10,100,000	10,100,000	1,100,000	1,100,000	4,300,000	4,300,000			4,100,000		5,500,000	5,500,000	800,000	800,000	3,100,000	3,100,000
Number of manufacturer-affiliated finance partners	4		4
Interest on real estate notes, minimum																													3.67%
Interest on real estate notes, maximum																													9.00%
Total interest expense excluding amortization cost										1,839,000		2,588,000											1,875,000	3,084,000
Amortization schedule																																20 years		20 years		15 years		20 years
Amortization cost of the 3.00% notes, 2.25% Notes and 8.25% Notes										1,810,000	[1]	2,410,000	[1]										5,366,000	5,590,000
Variable Interest Rate																														1.50%	3.35%																2.00%				0.50%
Total borrowings																																50,200,000	50,200,000	27,600,000	27,600,000	66,700,000	66,700,000			34,700,000	38,000,000	98,800,000	98,800,000	18,600,000	18,600,000	58,800,000	58,800,000
Convertible Debt, Fair Value Disclosures															533,500,000	533,500,000		533,500,000
Other Real Estate Related and Long-Term Debt																			316,703,000	279,167,000
Number of loans as per loan agreements																																8		2		14						17		2
Borrowings Of Long Term Debt Related To Real Estate Loans			$ 65,628,000	$ 21,105,000																													$ 0		$ 0		$ 0			$ 6,800,000			$ 37,900,000		$ 13,800,000

[1] Represents the incremental impact of the accounting for convertible debt as primarily codified in ASC 470, Debt