Annual report pursuant to Section 13 and 15(d)

Debt and Capital Lease Obligations (Details)

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Debt and Capital Lease Obligations (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2012
Credit Facility [Member]
Feb. 14, 2012
Credit Facility [Member]
Years
Line of Credit Facility [Line Items]      
Senior credit facility amount $ 100,000   $ 150,000
Base reference rate of credit facilities LIBOR LIBOR  
Basis spread on variable rate minimum (in hundredths) 0.60%   1.10%
Basis spread on variable rate maximum (in hundredths) 0.90%   1.60%
Interest rate spread above LIBOR as of reporting period (in hundredths) 0.90%    
Utilized for outstanding letters of credit 9,316    
Available borrowing capacity $ 90,684    
Credit facility term (in years)     5