Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of Statutory Tax Rate (Details)

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Income Taxes - Reconciliation of Statutory Tax Rate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Tax at statutory rate $ 25,412 $ 18,610 $ (21,222)
State income taxes, net of federal income tax benefit 4,779 1,203 (7,754)
Tax on global intangible low-taxed income 8,517 15,445 0
Impact of US Tax Reform 0 0 (132,158)
Non-US earnings transition tax 0 0 42,903
Changes in uncertain tax positions (1,288) (996) 974
Change in valuation allowances 2,032 5,075 6,771
Rate changes 2,322 (3,325) (151)
Foreign withholding taxes (5,869) 570 978
Foreign tax rate differential 217 3,329 (12,798)
Non-deductible transaction costs 22 84 1,679
Permanent difference created by foreign exchange gain or loss 1,880 (7,550) 3,502
Research and development tax credits (32) (1,173) 0
Other, net 2,707 (2,277) (1,921)
Total $ 40,699 $ 28,995 $ (119,197)