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Revenues - Impact on Condensed Consolidated Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Mar. 31, 2019
Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                
Net income for the period $ 72,793 $ 104,461 $ 36,368 $ 58,800 $ 84,917 $ 36,690 $ 213,622 $ 180,407
Deferred taxes             11,307 62,640
Accounts receivable             52,777 (55,698)
Contract assets             (28,872) 0
Prepaid expenses and other current assets             (495) (10,535)
Income taxes and deferred charges and credits             21,006 (22,068)
Accounts payable and accrued liabilities             (30,644) (92,278)
Deferred revenue             24,134 74,704
Other assets             4,300 (2,871)
Net cash provided by operating activities             646,501 $ 504,021
Adjustments | Accounting Standards Update 2014-09                
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                
Net income for the period (16,927)           (36,826)  
Deferred taxes             (12,720)  
Accounts receivable             (11,171)  
Contract assets             28,872  
Prepaid expenses and other current assets             1,340  
Income taxes and deferred charges and credits             16  
Accounts payable and accrued liabilities             (8)  
Deferred revenue             24,583  
Other assets             5,914  
Net cash provided by operating activities             0  
Proforma as if Topic 605 was in effect                
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                
Net income for the period $ 55,866           176,796  
Deferred taxes             (1,413)  
Accounts receivable             41,606  
Contract assets             0  
Prepaid expenses and other current assets             845  
Income taxes and deferred charges and credits             21,022  
Accounts payable and accrued liabilities             (30,652)  
Deferred revenue             48,717  
Other assets             10,214  
Net cash provided by operating activities             $ 646,501