Note 12 - Notes Payable (Details) - Notes Payable (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Debt Instrument [Line Items]
Balance (in Dollars)	$ 3,186,047		$ 3,192,127
Senior Notes [Member]
Debt Instrument [Line Items]
Balance (in Dollars)	1,140,900		965,900
Interest Rate Range (Low)	3.13%		4.70%
Interest Rate Range (High)	6.88%		6.88%
Medium-term Notes [Member]
Debt Instrument [Line Items]
Balance (in Dollars)	1,044,600		1,144,600
Interest Rate Range (Low)	4.30%		4.30%
Interest Rate Range (High)	5.78%		5.78%
Unsecured Debt [Member]
Debt Instrument [Line Items]
Balance (in Dollars)	400,000	[1]	400,000
Interest Rate Range (Low)		[1],[2]		[2]
Interest Rate Range (High)		[1],[2]		[2]
Canadian Notes Payable [Member]
Debt Instrument [Line Items]
Balance (in Dollars)	329,500		352,400
Interest Rate Range (Low)	3.86%		5.18%
Interest Rate Range (High)	5.99%		5.99%
Line of Credit [Member]
Debt Instrument [Line Items]
Balance (in Dollars)	194,500		249,900
Interest Rate Range (Low)		[2]		[2]
Interest Rate Range (High)		[2]		[2]
Mexican Term Loan [Member]
Debt Instrument [Line Items]
Balance (in Dollars)	76,500	[3]	76,900
Interest Rate Range (Low)		[3]	8.58%
Interest Rate Range (High)		[3]	8.58%
Notes Payable, Other Payables [Member]
Debt Instrument [Line Items]
Balance (in Dollars)			$ 2,400	[4]
Interest Rate Range (Low)				[4]
Interest Rate Range (High)				[4]

[1] During January 2014, the Company exercised its one-year extension option to extend the maturity date to April 17, 2015.

[2] Interest rate is equal to LIBOR + 1.05% (1.22% and 1.26% at December 31, 2013 and 2012, respectively).

[3] Interest rate is equal to TIIE (Equilibrium Interbank Interest Rate) plus 1.35% (5.15% at December 31, 2013).

[4] Interest rate is equal to LIBOR + 3.50% (5.50% at December 31, 2012).