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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts receivable, allowance for doubtful accounts (in dollars) $ 2,011 $ 1,581
Preferred stock, shares issued 0 0
Shares to be issued, shares 42,000 42,000
Common Class A [Member]
    
Common stock, shares issued 49,092,427 46,611,252
Common stock, shares outstanding 49,092,427 46,611,252
Common Class B [Member]
    
Common stock, shares issued 3,755 3,755
Common stock, shares outstanding 3,755 3,755