XML 17 R3.htm IDEA: XBRL DOCUMENT v3.8.0.1
Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Allowance for doubtful accounts receivable $ 6,739 $ 5,944
Accumulated amortization of finite-lived intangible assets $ 953,957 $ 730,234
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 400,000,000 400,000,000
Common stock, shares issued 208,109,294 204,616,054
Common stock, shares outstanding 206,535,955 203,042,715
Common stock, shares unvested 1,126 11,252
Treasury stock, shares 1,573,339 1,573,339
Class A Non-Voting Common Stock [Member]    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 5,000,000 5,000,000
Common stock, shares issued 0 0