Schedule II Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Balance at Beginning of year	$ 22,675	$ 23,588
Additions	242	0
Write-offs	0	(913)
Balance at end of year	$ 22,917	$ 22,675