Quarterly report pursuant to Section 13 or 15(d)

Commitments (Narratives) (Details)

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Commitments (Narratives) (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Revenues $ 176,104,000 $ 168,089,000 $ 348,011,000 $ 332,866,000  
US Treasury Department Contribution         1,600,000
Lifeline Program Support [Member]
         
Revenues $ 3,900,000   $ 8,000,000