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Fair Value of Financial Instruments (Summary of Valuation of Financial Instruments Reported at Fair Value on a Recurring Basis by Pricing Level) (Details) (Recurring basis [Member], USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Financial instruments reported at fair value on a recurring basis    
Cash and cash equivalents $ 47,003 $ 39,977
Interest rate contracts [Member]
   
Financial instruments reported at fair value on a recurring basis    
Interest rate contracts - liability position 140 219
Quoted market prices in active markets (Level 1) [Member]
   
Financial instruments reported at fair value on a recurring basis    
Cash and cash equivalents 47,003 39,977
Quoted market prices in active markets (Level 1) [Member] | Interest rate contracts [Member]
   
Financial instruments reported at fair value on a recurring basis    
Interest rate contracts - liability position 0 0
Significant other observable inputs (Level 2) [Member]
   
Financial instruments reported at fair value on a recurring basis    
Cash and cash equivalents 0 0
Significant other observable inputs (Level 2) [Member] | Interest rate contracts [Member]
   
Financial instruments reported at fair value on a recurring basis    
Interest rate contracts - liability position 140 219
Significant unobservable inputs (Level 3) [Member]
   
Financial instruments reported at fair value on a recurring basis    
Cash and cash equivalents 0 0
Significant unobservable inputs (Level 3) [Member] | Interest rate contracts [Member]
   
Financial instruments reported at fair value on a recurring basis    
Interest rate contracts - liability position $ 0 $ 0