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Income Taxes - Deferred Income Taxes Related to Temporary Differences between Tax Bases of Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Deferred Tax Liabilities:    
Accelerated Depreciation $ 257,537 $ 248,515
Prepaid Costs Currently Deductible 4,794 4,597
Other    2,451
Total Deferred Tax Liabilities 262,331 255,563
Deferred Tax Assets:    
Accrued Costs Not Yet Deductible 6,638 6,138
Allowance for Doubtful Accounts 775 1,163
Net Operating Loss Carry Forwards and Credits 2,736 12,103
Deferred Revenues 305 1,300
Share-Based Compensation 5,862 8,295
Other 4,812   
Total Deferred Tax Assets 21,128 28,999
Deferred Income Taxes, net $ 241,203 $ 226,564