Long-Term Liabilities (Maturities of Long-term Debt) (Details) (Term A Facility, Amended Credit Agreement, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Term A Facility | Amended Credit Agreement
   
Maturities of Long-term Debt [Abstract]    
2015 $ 81,250  
2016 93,750  
2017 118,750  
2018 656,250  
Total $ 950,000 $ 987,500