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Income Taxes - The components of the net deferred income tax asset (liability) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2013
Deferred tax assets:      
Deferred revenue $ 1,044 $ 2,158  
Depreciation and amortization 19,378 18,941  
Alternative minimum tax credit carryforward 2,124 1,782  
Net operating loss carryforwards 75,873 84,413  
Research and development tax credit carryforward 1,078 1,055  
Accrued expenses and other 8,572 8,349  
Total deferred tax assets 108,069 116,698  
Deferred tax liabilities:      
Depreciation and amortization (2,791) (973)  
Intangible assets (6,595) (8,315)  
Unrealized gain on marketable securities 0 (92)  
Deferred expenses and other (577) (571)  
Total deferred tax liabilities (9,963) (9,951)  
Valuation allowance:      
Beginning balance (108,066) (107,490)  
Decrease (increase) during the period 7,574 (576)  
Total valuation allowance (100,492) (108,066)  
Deferred income taxes 84 56 84
Deferred income tax liability (2,470) (1,375) (2,896)
Deferred income tax liability $ (2,386) $ (1,319)