|**Income Taxes**                                     | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
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|**Income Taxes [Abstract]**                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Income Taxes                                         | (9)   Income Taxes:The following is a reconciliation of the provision for income taxes computed at federal statutory rates to the effective rates:For the three months endedFor the six months endedJune 30,June 30,2013201220132012Consolidated tax provision at federal statutory rate35.0%35.0%35.0%35.0%State income tax provisions, net of federal incometax benefit9.23.1(8.2)2.8Noncontrolling interest(0.6)(1.4)-(1.1)Tax reserve adjustment7.7(2.1)(15.4)(0.2)Changes in certain deferred tax balances(10.6)-22.6-IRS audit adjustments(9.0)-19.3-All other, net1.10.20.80.2Effective tax rate32.8%34.8%54.1%36.7%Income taxes for the three and six months ended June 30, 2013 include the impact of a charge of $5.2 million resulting from the settlement of the 2010 IRS audit and a $6.0 million charge resulting from the adjustment of deferred tax balances, partially offset by a $4.4 million benefit from the net reversal of reserves for uncertain tax positions.The amount of our uncertain tax positions whose statute of limitations are expected to expire during the next twelve months and which would affect our effective tax rate is $2.4 million as of June 30, 2013.
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|Consolidated tax provision at federal statutory rate |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|State income tax provisions, net of federal income   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|tax benefit                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Noncontrolling interest                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Tax reserve adjustment                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Changes in certain deferred tax balances             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|IRS audit adjustments                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|All other, net                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Effective tax rate                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
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