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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Allowance for doubtful accounts receivable (in dollars) $ 1,569 $ 1,581
Accumulated depreciation (in dollars) $ 119,918 $ 115,792
Preferred stock, shares issued 0 0
Shares to be issued, shares 28,000 28,000
Common Class A [Member]
    
Common stock, shares issued 31,332,273 31,074,168
Common stock, shares outstanding 31,332,273 31,074,168
Common Class B [Member]
    
Common stock, shares issued 2,503 2,503
Common stock, shares outstanding 2,503 2,503