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Income Taxes (Summary Of Deferred Tax Assets And Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Deferred Tax Assets And Liabilities [Line Items]    
Reserve for uncollectible accounts receivable $ 1,379 $ 1,363
Accrued compensation 6,342 4,217
Other reserves 3,154 2,618
Current deferred tax assets 4,838 3,314
Accrued compensation 4,670 4,376
Other reserves 966 1,020
Operating loss carryforwards 581 415
Income tax basis in excess of financial basis of goodwill   150
Less valuation allowance (108) (379)
Total deferred tax assets 16,984 13,780
Prepaids (1,939) (1,614)
Other receivables (4,098) (3,270)
Current deferred tax liabilities (6,037) (4,884)
Property and equipment (27,457) (12,332)
Goodwill (70,416) (64,989)
Non-current deferred tax liabilities (91,764) (71,739)
Total deferred tax liabilities (103,910) (82,205)
Deferred Income Tax Charges [Member]
    
Deferred Tax Assets And Liabilities [Line Items]    
Current deferred tax assets 10,875 8,198
Non-current deferred tax assets 6,109 5,582
Non-current deferred tax liabilities $ (97,873) $ (77,321)