v2.4.0.8
Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) (Fair Value, Measurements, Recurring, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value assets measured on recurring basis $ 23,899 $ 19,492 $ 13,413
Fair value liabilities measured on recurring basis 103,066 125,495 107,029
Fair Value, Inputs, Level 2
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value assets measured on recurring basis 23,899 19,492 13,413
Fair value liabilities measured on recurring basis 48,581 35,486 24,647
Fair Value, Inputs, Level 3
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value liabilities measured on recurring basis 54,485 90,009 82,382
Foreign Exchange Forward
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value liabilities measured on recurring basis 15,403    
Foreign Exchange Forward | Fair Value, Inputs, Level 2
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value liabilities measured on recurring basis 15,403    
Deferred Compensation Liabilities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value liabilities measured on recurring basis 23,572 19,843 14,071
Deferred Compensation Liabilities | Fair Value, Inputs, Level 2
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value liabilities measured on recurring basis 23,572 19,843 14,071
Contingent Consideration Liabilities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value liabilities measured on recurring basis 54,485 90,009 82,382
Contingent Consideration Liabilities | Fair Value, Inputs, Level 3
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value liabilities measured on recurring basis 54,485 90,009 82,382
Interest Rate Swap
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value assets measured on recurring basis 52    
Fair value liabilities measured on recurring basis 9,606 15,643 10,576
Interest Rate Swap | Fair Value, Inputs, Level 2
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value assets measured on recurring basis 52    
Fair value liabilities measured on recurring basis 9,606 15,643 10,576
Cash Surrender Value
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value assets measured on recurring basis 23,847 19,492 13,413
Cash Surrender Value | Fair Value, Inputs, Level 2
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value assets measured on recurring basis $ 23,847 $ 19,492 $ 13,413