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Retirement Benefit Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Contribution Plans [Abstract]      
U.S defined contribution $ 8,928 $ 9,153 $ 8,625
Employer discretionary contribution amount 400 600 300
Employee Stock Ownership Plan (ESOP), Debt Structure [Abstract]      
Provision for expense in connection with ESOP 2,600 2,200 2,000
Net periodic benefit cost (262) (653) [1] 722 [1]
Supplemental Executive Retirement Plan [Member]      
Employee Stock Ownership Plan (ESOP), Debt Structure [Abstract]      
Benefit obligation outstanding 0 0  
Net periodic benefit cost $ 0 $ 0 $ 0
Employee Stock Ownership Plan and Trust (ESOP) [Member]      
Employee Stock Ownership Plan (ESOP), Debt Structure [Abstract]      
Additional shares contributed to ESOP (in shares) 53,300    
Shares released from trust (in shares) 53,300    
Total remaining balance of shares in the ESOP (in shares) 200    
[1] Net periodic benefit credit (cost) has been reclassified from selling, general and administrative expenses to other non-operating income (expense), net on our consolidated statement of operations upon adoption of ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, see Note 1, "Summary of Significant Accounting Policies" for additional information.