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Goodwill and Other Intangible Assets (Details 4) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Estimate of the amount and classification of amortization expense for definite-lived intangible assets  
Amortization Expense, 2013 $ 2,676
Amortization Expense, 2014 5,740
Amortization Expense, 2015 5,452
Amortization Expense, 2016 5,392
Amortization Expense, 2017 5,304
Operations Expense, 2013 67
Operations Expense, 2014 126
Operations Expense, 2015 113
Operations Expense, 2016 111
Operations Expense, 2017 111
Interest Expense, 2013 1,636
Interest Expense, 2014 2,164
Interest Expense, 2015 1,108
Interest Expense, 2016 580
Interest Expense, 2017 $ 487