XML 78 R49.htm IDEA: XBRL DOCUMENT v3.10.0.1
Significant Accounting Policies - Schedule of impact of Topic 606 adoption on Statement of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Operations data:        
Revenues $ 1,247,917 $ 1,277,439 $ 2,133,205 $ 2,133,372
Costs and Expenses:        
Direct costs 908,941 942,246 1,774,387 1,795,478
Income tax expense (88,889) (42,028) (91,421) (14,934)
Net income $ 223,954 $ 117,098 395,499 $ (3,256)
Balances Without Adoption of ASC 606        
Statement of Operations data:        
Revenues     2,132,707  
Costs and Expenses:        
Direct costs     1,778,729  
Income tax expense     (91,368)  
Net income     390,712  
Effect of Change Higher/(Lower) | ASU 2014-09        
Statement of Operations data:        
Revenues     498  
Costs and Expenses:        
Direct costs     (4,342)  
Income tax expense     (53)  
Net income     $ 4,787