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
Allowance for doubtful accounts receivable [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 1,693	$ 811	$ 591
Additions, Charge (Credit) to Costs and Expenses	303	882	221
Deductions, Credit to the respective receivable	0	0	(1)
Balance at End of Year	1,996	1,693	811
Allowance for doubtful employee advances and miscellaneous receivables [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	538	272	669
Additions, Charge (Credit) to Costs and Expenses	1,176	584	366
Deductions, Credit to the respective receivable	(1,312)	(318)	(763)
Balance at End of Year	402	538	272
Deferred tax valuation allowance [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	48,489	51,630	54,801
Additions, Charge (Credit) to Costs and Expenses	(36)	(3,141)	(3,171)
Deductions, Credit to the respective receivable	0	0	0
Balance at End of Year	$ 48,453	$ 48,489	$ 51,630