Schedule II - Valuation and Qualifying Accounts (Details) (Allowance for Doubtful Accounts [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 399		$ 387		$ 1,150
Charged to Cost and Expenses	67		12		38
Deductions	(49)	[1]	0	[1]	(801)	[1]
Balance at End of Year	$ 417		$ 399		$ 387

[1] Primarily payments and adjustments to required reserves.