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Long-Term Debt (Term Loans) (Details) (USD $)
1 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
SUSP Term Loan [Member]
Term Loan [Member]
Sep. 25, 2012
SUSP Term Loan [Member]
Term Loan [Member]
Sep. 25, 2012
SUSP Term Loan [Member]
Federal Funds Rate [Member]
Term Loan [Member]
Sep. 25, 2012
SUSP Term Loan [Member]
LIBOR [Member]
Term Loan [Member]
Sep. 25, 2012
SUSP Term Loan [Member]
LIBOR plus Federal Funds Rate or LIBOR plus Prime Rate [Member]
Term Loan [Member]
Debt Instrument [Line Items]              
Face amount     $ 180,700,000 $ 180,700,000      
Basis spread on variable rate         0.50% 1.00% 0.25%
Interest rate at end of period     0.43%        
Covenant collateral percentage amount     98.00%        
Marketable securities $ 37,936,000 $ 148,264,000