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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Accounts receivable, trade, allowance for doubtful accounts $ 4,498 $ 4,276
Property and equipment, accumulated depreciation $ 215,324 $ 186,242
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 45,000,000 45,000,000
Preferred stock, shares issued 0 0
Common Class A [Member]    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 360,000,000 360,000,000
Common stock shares issued 62,108,853 61,762,944
Common stock, shares outstanding 60,898,582 60,552,673
Treasury stock, shares 1,210,271 1,210,271
Common Class B [Member]    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 90,000,000 90,000,000
Common stock shares issued 11,484,408 11,484,408
Common stock, shares outstanding 11,484,408 11,484,408