Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Restricted cash and investments, current	$ 11,518		$ 15,654
Allowance for doubtful accounts	2,549		2,546
Restricted cash and investments, non-current	18,349		32,756
Property and equipment, net	1,727,798	[1]	1,687,159	[1]
Current portion of capital lease obligations, long-term debt and non-recourse debt	22,163		53,882
Non-recourse debt	66,153		104,836
Preferred stock, par value	$ 0.01		$ 0.01
Preferred stock, shares authorized	30,000,000		30,000,000
Preferred stock, shares issued	0		0
Preferred stock, shares outstanding	0		0
Common stock, par value	$ 0.01		$ 0.01
Common stock, shares authorized	90,000,000		90,000,000
Common stock, shares issued	86,662,676		86,007,433
Common stock, shares outstanding	72,082,571		71,417,034
Treasury stock, shares	14,580,605		14,590,399
Variable Interest Entity, Primary Beneficiary
Restricted cash and investments, current	0		6,182
Restricted cash and investments, non-current	0		15,521
Property and equipment, net	0		25,840
Current portion of capital lease obligations, long-term debt and non-recourse debt	0		5,200
Non Recourse Debt Noncurrent	$ 0		$ 16,997

[1] As of December 31, 2013 and 2012 Canada did not have any significant long-lived assets.