Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (Recurring [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation	$ 5,241	$ 4,540
Derivative instruments		223
Assets	5,241	4,763
Contingent consideration	10,888	11,519
Deferred compensation	8,139	7,015
Deriviative liabilities	123
Liabilities, Fair Value Disclosure, Total	19,150	18,534
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation	5,241	4,540
Assets	5,241	4,540
Deferred compensation	8,139	7,015
Liabilities, Fair Value Disclosure, Total	8,139	7,015
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative instruments		223
Assets		223
Deriviative liabilities	123
Liabilities, Fair Value Disclosure, Total	123
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration	10,888	11,519
Liabilities, Fair Value Disclosure, Total	$ 10,888	$ 11,519