Quarterly report pursuant to Section 13 or 15(d)

Organization and Basis of Presentation - Changes Due to Adoption of Topic 606 (Details)

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Organization and Basis of Presentation - Changes Due to Adoption of Topic 606 (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Oct. 01, 2018
Sep. 30, 2018
ASSETS      
Accounts receivable — unbilled $ 124,385 $ 66,950 $ 31,536
Deferred income taxes 209 209 6,834
LIABILITIES AND SHAREHOLDERS’ EQUITY      
Deferred revenue - current 37,231 39,415 51,182
Deferred income taxes - long-term 49,617 33,451 26,377
Retained earnings 664,332 666,210 633,281
Noncontrolling interests 2,782 3,105 2,552
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606      
ASSETS      
Accounts receivable — unbilled (34,233) 35,414  
Deferred income taxes 6,743 (6,625)  
LIABILITIES AND SHAREHOLDERS’ EQUITY      
Deferred revenue - current 12,521 (11,767)  
Deferred income taxes - long-term (6,764) 7,074  
Retained earnings (33,349) 32,929 $ 32,900
Noncontrolling interests $ (723) $ 553