Long-Term Debt, Interest Rate Swap and Capitalized Lease Obligations (Schedule of Long-term Debt) (Details) (USD $) In Thousands, unless otherwise specified						12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Interest rate swap	Dec. 31, 2013 Mortgages Mortgage loan with a syndicate of banks; issued in March 2011, amended May 2013; payable monthly, interest at 4.5% above LIBOR, a portion of which is fixed at 6.87% based on the interest rate swap described below.	Dec. 31, 2012 Mortgages Mortgage loan with a syndicate of banks; issued in March 2011, amended May 2013; payable monthly, interest at 4.5% above LIBOR, a portion of which is fixed at 6.87% based on the interest rate swap described below.	Dec. 31, 2013 Mortgages Mortgage loan with a syndicate of banks; issued in March 2011, amended May 2013; payable monthly, interest at 4.5% above LIBOR, a portion of which is fixed at 6.87% based on the interest rate swap described below. Interest rate swap	Dec. 31, 2013 Mortgages Mortgage loan with a syndicate of banks; issued in March 2011, amended May 2013; payable monthly, interest at 4.5% above LIBOR, a portion of which is fixed at 6.87% based on the interest rate swap described below. LIBOR	Dec. 31, 2013 Revolving credit facility Revolving credit facility borrowings payable to a bank; entered into in March 2010; amended in March 2011 and further amended May 2013 as described below; secured by receivables of the Company; interest at 4.5% above LIBOR.	Dec. 31, 2012 Revolving credit facility Revolving credit facility borrowings payable to a bank; entered into in March 2010; amended in March 2011 and further amended May 2013 as described below; secured by receivables of the Company; interest at 4.5% above LIBOR.	Dec. 31, 2013 Revolving credit facility Revolving credit facility borrowings payable to a bank; entered into in March 2010; amended in March 2011 and further amended May 2013 as described below; secured by receivables of the Company; interest at 4.5% above LIBOR. LIBOR	Dec. 31, 2013 Commercial loan Commercial loan of consolidated VIE, payable by variable interest entity landlord to a bank; issued in January 2011; payable monthly, fixed interest rate of 5.3%.	Dec. 31, 2012 Commercial loan Commercial loan of consolidated VIE, payable by variable interest entity landlord to a bank; issued in January 2011; payable monthly, fixed interest rate of 5.3%.
Debt Instrument [Line Items]
Long-term debt	$ 52,910			$ 44,434	$ 22,313			$ 3,000	$ 0
Long term debt, VIE											5,476	5,678
Total long term debt	52,910	27,991
Less current portion	(4,211)	(631)
Long-term debt, excluding current maturities	$ 48,699	$ 27,360
Long-term debt, interest rate						6.87%	4.50%			4.50%
Long-term debt fixed based on the interest rate swap	6.87%		6.87%								5.30%