Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Parenthetical)

v3.10.0.1
Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Trade accounts receivable, allowances $ 25,609 $ 51,180
Preferred Stock, par value $ 0.001 $ 0.001
Preferred Stock, shares authorized 10,000,000 10,000,000
Preferred Stock, shares issued 0 0
Preferred Stock, shares outstanding 0 0
Class A Common Stock [Member]    
Common Stock, par value $ 0.001 $ 0.001
Common Stock, shares authorized 500,000,000 500,000,000
Common Stock, shares issued 130,802,000 131,784,000
Common Stock, shares outstanding 130,802,000 131,784,000
Class B Common Stock [Member]    
Common Stock, par value $ 0.001 $ 0.001
Common Stock, shares authorized 75,000,000 75,000,000
Common Stock, shares issued 24,163,000 24,545,000
Common Stock, shares outstanding 24,163,000 24,545,000