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U.K. Pension Plan Funded Status (Details) - Foreign Plan [Member] - Pension Plan [Member] - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Mar. 25, 2015
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, contribution percent by employer   60.00%    
Defined benefit plan, contribution percent by participant   40.00%    
Projected benefit obligation (100%)   $ 698,809 $ 607,003  
Fair value of plan assets (100%)   531,671 450,281  
Funded status (100%)   (167,138) (156,722)  
Employees' share of deficit (40%)   (66,855) (62,689)  
Net pension liability recognized in the balance sheet (60%)   (100,283) (94,033)  
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit obligation at beginning of period   419,286 364,202 $ 348,033
Service cost $ 11,345 15,401 12,980  
Interest cost $ 8,812 10,194 12,074  
Defined Benefit Plan, Benefit Obligation, Benefits Paid   (13,580) (8,853)  
Actuarial loss/(gain)   6,697 59,008  
Exchange rate changes   36,372 (59,040)  
Benefit obligation at end of period   419,286 364,202 348,033
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets at beginning of period   319,003 270,169 277,308
Actual return on plan assets   27,847 38,360  
Defined Benefit Plan, Plan Assets, Benefits Paid   (13,580) (8,853)  
Employer contributions   8,531 8,607  
Exchange rate changes   26,036 (45,253)  
Fair value of plan assets at end of year   319,003 270,169 $ 277,308
Funded status   $ (100,283) $ (94,033)