Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Capital assets and other	$ 20,831	$ 10,987
Net operating loss carry forwards	47,139	60,705
Interest deductions	20,819	16,797
Refinancing charge	0	669
Goodwill and intangibles	122,045	117,421
Stock compensation	1,693	1,736
Pension plan	4,856	4,414
Unrealized foreign exchange	11,995	11,373
Capital loss carry forwards	13,657	13,081
Accounting reserves	77,870	76,397
Gross deferred tax asset	320,905	313,580
Less: valuation allowance	(198,452)	(65,649)
Net deferred tax assets	122,453	247,931
Deferred tax liabilities:
Right-of-use assets	(57,890)	(67,613)
Refinancing charge	(1,675)	0
Withholding taxes	(475)	(546)
Capital assets	(1,893)	(382)
Goodwill amortization	(88,326)	(98,677)
Total deferred tax liabilities	(150,259)	(167,218)
Net deferred tax asset (liability)	(27,806)
Net deferred tax asset (liability)		80,713
Disclosed as:
Deferred tax assets	179	84,900
Deferred tax liabilities	$ (27,985)	$ (4,187)

The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from deferred acquisition consideration, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

No definition available.