Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Income Taxes [Abstract]

Provision for income taxes

(in thousands)	Year Ended December 31,
	2012		2011		2010
Current	$	4,886	$	5,741	$	8,754
Deferred		23,204		25,715		13,817
	$	28,090	$	31,456	$	22,571

Reconciliation of federal statutory tax rate to the Company's effective tax rate

	Year Ended December 31,
	2012			2011			2010
Federal statutory rate		35.0	%		35.0	%		35.0	%
State taxes, net of federal benefit		4.2			4.1			4.2
Other		(0.6	)		(0.3	)		(1.0	)
		38.6	%		38.8	%		38.2	%

Deferred income taxes related to the temporary differences between the tax bases of assets and liabilities

(in thousands)	December 31,
	2012		2011
Deferred Tax Liabilities:
Accelerated Depreciation	$	248,515	$	238,912
Prepaid Costs Currently Deductible		4,597		4,178
Other		2,451		2,414
Total Deferred Tax Liabilities		255,563		245,504
Deferred Tax Assets:
Accrued Costs Not Yet Deductible		6,138		6,017
Allowance for Doubtful Accounts		1,163		582
Net Operating Loss Carry Forwards and Credits		12,103		25,495
Deferred Revenues		1,300		243
Stock Based Compensation		8,295		7,801
Total Deferred Tax Assets		28,999		40,138
Deferred Income Taxes, net	$	226,564	$	205,366