v2.4.0.8
Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Current income tax expense:      
Federal $ (9,709,000) $ (37,323,000) $ (14,922,000)
State (2,868,000) (7,211,000) (2,699,000)
Foreign         
Total current (12,577,000) (44,534,000) (17,621,000)
Deferred income tax expense:      
Federal (23,051,000) (12,956,000) (11,182,000)
State (3,797,000) (2,302,000) (1,925,000)
Foreign         
Total deferred (26,848,000) (15,258,000) (13,107,000)
Total income tax expense (39,425,000) (59,792,000) (30,728,000)
Reconciliation of income taxes [Abstract]      
Federal statutory income tax rate (in hundredths) 35.00% 35.00% 35.00%
Tax at the federal statutory rate (35,523,000) (53,530,000) (27,056,000)
State income taxes, net of federal benefit, including adjustments based on filed state income tax returns (3,686,000) (5,812,000) (2,926,000)
Nontaxable (nondeductible) items (940,000) 2,000 (624,000)
Adjustment to filed returns (18,000) (45,000) 1,000
Foreign income tax at different rate than U.S. (32,000)      
Change in valuation allowance (42,000)      
Non-taxable earnings of non-controlling interests 95,000      
Tax credits 254,000 174,000 (1,000)
Changes in estimated state tax rates 660,000 (667,000)   
Other (193,000) 86,000 (122,000)
Income tax expense (39,425,000) (59,792,000) (30,728,000)
Operating Loss Carryforwards [Line Items]      
Expected utilization period (in years) within the next year    
Excess tax benefits related to stock option plans [Abstract]      
Excess tax benefits related to stock option plans 3,015,000 3,447,000 1,324,000
Deferred tax assets:      
Net operating loss carryforwards 6,517,000 13,257,000  
Accruals and other, principally due to differences in employee compensation and benefits 9,429,000 11,262,000  
Other liabilities, principally due to differences in revenue recognition 10,193,000 9,064,000  
Total deferred tax assets, gross 26,139,000 33,583,000  
Valuation allowances (42,000) 0  
Total deferred tax assets, net 26,097,000 33,583,000  
Deferred tax liabilities:      
Equipment and leasehold improvements, principally due to differences in bases and depreciation methods (79,974,000) (60,488,000)  
Intangible assets, principally due to differences in bases and amortization methods (22,939,000) (24,928,000)  
Allowance for uncollectible accounts (18,429,000) (17,769,000)  
Goodwill (3,577,000) (2,547,000)  
Other (1,057,000) (1,332,000)  
Total deferred tax liabilities (125,976,000) (107,064,000)  
Net deferred tax liability (99,879,000) (73,481,000)  
Liability for uncertain tax positions 1,600,000    
Corresponding asset recorded against the tax liability 1,600,000    
State
      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 6,800,000    
Net operating loss carryforwards relating to pre-acquisition periods 67,700,000    
Federal
      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards relating to pre-acquisition periods $ 9,600,000