Long-Term Debt, Interest Rate Swap and Capitalized Lease Obligations (Schedule of Long-term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Long-term debt	$ 27,991
Total long term debt	27,991	27,955
Less current portion	(631)	(576)
Long-term debt, excluding current maturities	27,360	27,379
Long-term debt fixed based on the interest rate swap	7.07%
Mortgages | Mortgage loan with a syndicate of banks; issued in March 2011; payable monthly, interest at 4.5% above LIBOR but fixed at 7.07% based on the interest rate swap described below.
Debt Instrument [Line Items]
Long-term debt	22,313	22,715
Mortgages | Mortgage loan with a syndicate of banks; issued in March 2011; payable monthly, interest at 4.5% above LIBOR but fixed at 7.07% based on the interest rate swap described below. | Interest rate swap
Debt Instrument [Line Items]
Long-term debt, interest rate	7.07%
Mortgages | Mortgage loan with a syndicate of banks; issued in March 2011; payable monthly, interest at 4.5% above LIBOR but fixed at 7.07% based on the interest rate swap described below. | LIBOR
Debt Instrument [Line Items]
Long-term debt, interest rate	4.50%
Revolving credit facility | Revolving credit facility borrowings payable to a bank; entered into in March 2010; amended in March 2011 as described below; secured by receivables of the Company; interest at 4.5% above LIBOR.
Debt Instrument [Line Items]
Long-term debt	0	0
Revolving credit facility | Revolving credit facility borrowings payable to a bank; entered into in March 2010; amended in March 2011 as described below; secured by receivables of the Company; interest at 4.5% above LIBOR. | LIBOR
Debt Instrument [Line Items]
Long-term debt, interest rate	4.50%
Commercial loan | Commercial loan of consolidated VIE, payable by VIE landlord to a bank; issued in January 2011; payable monthly, fixed interest rate of 5.3%.
Debt Instrument [Line Items]
Long term debt, VIE	$ 5,678	$ 5,240
Long-term debt fixed based on the interest rate swap	5.30%