Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (Recurring [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	$ 4,610	$ 2,564
Liabilities	19,243	19,465
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	4,248	2,564
Liabilities	6,607	4,468
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	362
Liabilities		436
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	12,636	14,561
Contingent Consideration Related To Acquisitions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	12,636	14,561
Contingent Consideration Related To Acquisitions [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	12,636	14,561
Deferred Compensation [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	4,248	2,564
Liabilities	6,607	4,468
Deferred Compensation [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	4,248	2,564
Liabilities	6,607	4,468
Unrealized Loss On Derivative Instruments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	362
Unrealized Loss On Derivative Instruments [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	362
Unrealized Loss On Derivative Instruments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities		436
Unrealized Loss On Derivative Instruments [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities		$ 436