Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for doubtful accounts receivable [Member]
Description
Balance at Beginning of Year	$ 811	$ 591	$ 1,032
Additions Charge (Credit) to Costs and Expenses	882	221	(360)
Deductions Credit to the respective receivable (1)		(1)	(81)
Balance at End of Year	1,693	811	591
Allowance for doubtful employee advances and miscellaneous receivables [Member]
Description
Balance at Beginning of Year	272	669	351
Additions Charge (Credit) to Costs and Expenses	584	366	559
Deductions Credit to the respective receivable (1)	(318)	(763)	(241)
Balance at End of Year	538	272	669
Deferred tax valuation allowance [Member]
Description
Balance at Beginning of Year	51,630	54,801	58,304
Additions Charge (Credit) to Costs and Expenses	(3,141)	(3,171)	(3,503)
Deductions Credit to the respective receivable (1)
Balance at End of Year	$ 48,489	$ 51,630	$ 54,801