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Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Fair value assets measured on recurring basis $ 29,782 $ 28,242
Fair value liabilities measured on recurring basis 36,267 40,093
Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Fair value assets measured on recurring basis 29,782 28,242
Fair value liabilities measured on recurring basis 31,683 32,798
Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Fair value liabilities measured on recurring basis 4,584 7,295
Cash surrender value of life insurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Fair value assets measured on recurring basis 29,782 28,242
Cash surrender value of life insurance | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Fair value assets measured on recurring basis 29,782 28,242
Contingent Consideration Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Fair value liabilities measured on recurring basis 4,584 7,295
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 4,584 7,295
Deferred Compensation Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Fair value liabilities measured on recurring basis 30,336 27,580
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 30,336 27,580
Interest Rate Swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Fair value liabilities measured on recurring basis 1,347 5,218
Interest Rate Swap | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Fair value liabilities measured on recurring basis $ 1,347 $ 5,218