Schedule II: Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 102,217	$ 110,610	$ 110,046
Charged to expense	(100,792)	(8,035)	588
Deductions from reserves	(405)	(358)	(24)
Balance and end of period	1,020	102,217	110,610
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	737	1,043	2,556
Charged to expense	0	52	12
Deductions from reserves	(405)	(358)	(1,525)
Balance and end of period	332	737	1,043
Allowance for Notes Receivable [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	988	1,501	0
Charged to expense	(300)	(513)	0
Deductions from reserves	0	0	1,501	[1]
Balance and end of period	688	988	1,501
Valuation Allowance on Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	100,492	108,066	107,490
Charged to expense	(100,492)	(7,574)	576
Deductions from reserves	0	0	0
Balance and end of period	$ 0	$ 100,492	$ 108,066

[1] Reflects reclassification from allowance for doubtful accounts on trade receivables to allowance for notes receivable.