Schedule II - Valuation and Qualifying Acconts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 202	$ 177
Addition charged to costs and expenses	25	9
Other additions (deductions)	0	0
Less deductions	0	0
Balance at end of year	177	168
Deferred tax asset valuation allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	56,574	63,931
Addition charged to costs and expenses	0	0
Other additions (deductions)	(7,357)	(4,502)
Less deductions	0	0
Balance at end of year	$ 63,931	$ 68,433