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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Current Assets:    
Receivables, allowance for doubtful accounts $ 695 $ 523
Property and Equipment, accumulated depreciation 309,955 285,322
Capitalized Software, accumulated amortization 350,045 303,540
Intangible Assets, accumulated amortization $ 1,552 $ 0
Equity:    
Series Preferred stock, par value $ 0.05 $ 0.05
Series Preferred stock, shares authorized 50,000 50,000
Series Preferred stock, shares issued 0 0
Series Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 750,000,000 750,000,000
Common stock, shares issued 157,069,000 159,031,000
Common stock, shares outstanding 157,069,000 159,031,000