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Long-term Debt, Lease Obligations and Interest Rate Caps (Details Textual) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2010
Jun. 30, 2005
lease
Dec. 31, 2012
Dec. 31, 2001
May 29, 2012
Dec. 31, 2011
Aug. 31, 2010
August 2011 Caps [Member]
Jul. 31, 2011
July 2011 Caps [Member]
Aug. 31, 2010
August 2010 [Member]
Dec. 31, 2012
August 2010 [Member]
Dec. 31, 2012
First Amendment [Member]
Mar. 31, 2012
Line of Credit Facility [Member]
Dec. 31, 2012
Line of Credit Facility [Member]
Mar. 31, 2012
Line of Credit Facility [Member]
Eurodollar Borrowing [Member]
Dec. 31, 2012
Line of Credit Facility [Member]
Eurodollar Borrowing [Member]
Notes Payable Long-term Debt, Lease Obligations and Interest Rate Caps (Textual) [Abstract]                              
Revolving line of credit borrowings                     $ 175,000,000        
Outstanding term loan indebtedness under Credit Facility     97,250,000   98,300,000 0                  
Debt instrument basis spread on variable rate under option one                         0.50% 3.50% 2.40%
Debt instrument basis spread on variable rate under option two                         1.00%    
Debt instrument basis spread on variable rate under option three                       2.50% 1.40%    
Accrued interest rate on credit facility     2.67%                        
Fixed charge coverage ratio     1.125                        
Leverage ratio     3.25                        
Percentage of tangible net worth for covenants compliance 60.00%                            
Initial notional amount of interest rate caps purchased             103,300,000                
Interest rate cap                 three-month average LIBOR cap of 2.0%            
LIBOR portion of interest rate owned by company                 2.00% 2.00%          
Interest rate caps purchased               700,000              
Amounts included in accumulated other comprehensive income     400,000                        
Changes in fair value of interest rate caps     100,000                        
Lease term, sale-leaseback transaction   12 years   12 years                      
Operating lease term   10 years                          
Number of lease arrangements   2                          
Commitment recorded under second lease     5,500,000                        
Lease obligation at implicit rate     11.70%                        
Lease obligation amount outstanding     $ 2,300,000                        
Extension period option of renewable leases     20 years                        
Interest accrues under the capital leases     6.00%