Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for doubtful accounts receivable [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 1,996	$ 1,693	$ 811
Additions, Charge (Credit) to Costs and Expenses	253	303	882
Deductions, Credit to the respective receivable	(6)	0	0
Balance at End of Year	2,243	1,996	1,693
Allowance for doubtful employee advances and miscellaneous receivables [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	402	538	272
Additions, Charge (Credit) to Costs and Expenses	1,125	1,176	584
Deductions, Credit to the respective receivable	(835)	(1,312)	(318)
Balance at End of Year	692	402	538
Deferred tax valuation allowance [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	48,453	48,489	51,630
Additions, Charge (Credit) to Costs and Expenses	3,549	(36)	(3,141)
Deductions, Credit to the respective receivable	0	0	0
Balance at End of Year	$ 52,002	$ 48,453	$ 48,489